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English Grammar in Use.

1.1 Complete the sentences with one of the following verbs in the correct form:

1.2 Use the words in brackets to complete the questions.

1.3 Put the verb into the correct form. Sometimes you need the negative (I'm not doing etc.).

1.4 Read this conversation between Brian and Sarah. Put the verbs into the correct form.

1.5 Complete the sentences using one of these verbs: get change rise fall increase

2.1 Complete the sentences using one of the following:

2.2 Put the verb into the correct form.

2.3 Use one of the following verbs to complete these sentences. Sometimes you need the negative:

2.4 Ask Liz questions about herself and her family.

2.5 Complete using one of the following.

3.1 Are the underlined verbs right or wrong? Correct the verbs that are wrong.

3.2 Put the verb in the correct form, present continuous or present simple.

4.1 Are the underlined verbs right or wrong? Correct the ones that are wrong.

4.3 Put the verb into the correct form, present continuous or present simple.

4.4 Complete the sentences using the most suitable form of be. Sometimes you must use the simple (am/is/are) and sometimes the continuous is more suitable (am/is/are being).

5.1 Read what Sharon says about a typical working day:

5.2 Put one of these verbs in each sentence:

5.3 A friend has just come back from holiday. You ask him about it. Write your questions.

5.4 Complete the sentences, Put the verb into the correct form, positive or negative.

6.1 What were you doing at the following times? Write one sentence as in the examples. The past continuous is not always necessary (see the second example).

6.2 Use your own ideas to complete these sentences. Use the past continuous.

6.3 Put the verbs into the correct form, past continuous or past simple.

6.4 Put the verbs into the correct form, past continuous or past simple.

7.1 You are writing a letter to a friend. In the letter you give news about yourself and other people. Use the words given to make sentences. Use the present perfect.

7.2 Read the situations and write sentences. Choose one of the following:

7.4 Read the situations and write sentences with just, already or yet.

7.5 Put in been or gone.

8.1 You are asking somebody questions about things he or she has done. Make questions from the words in brackets.

8.2 Complete Bs answers. Some sentences are positive and some negative. Use a verb from this list:

8.3 Complete these sentences using today/this year/this term etc.

8.4 Read the situations and write sentences as shown in the examples.

9.1 What have these people been doing or what has been happening?

9.2 Write a question for each situation.

9.3 Read the situations and complete the sentences.

10.1 Read the situations and write two sentences using the words in brackets.

10.2 For each situation, ask a question using the words in brackets.

10.3 Put the verb into the more suitable form, present perfect simple (I have done etc.) or continuous (I have been doing etc.).

11.1 Are the underlined verbs right or wrong? Correct them if they are wrong.

11.2 Read the situations and write questions from the words in brackets.

11.3 Complete Bs answers to a's questions.

12.1 Write questions with how long and when.

12.2 Read the situations and complete the sentences beginning in the way shown.

12.3 Put in for or since.

12.4 Write Bs sentences using the words in brackets.

13.1 What has happened in these situations?

13.2 Put the verbs in brackets in the correct form, present perfect or past simple.

13.3 Are the underlined parts of these sentences right or wrong? Correct the ones that are wrong.

13.4 (Section c) Put the verb into the most suitable form, present perfect or past simple.

14.1 Are the underlined parts of these sentences right or wrong? Correct the ones that are wrong.

14.2 Make sentences from the words in brackets. Use the present perfect or past simple.

14.3 Put the verb into the correct form, present perfect or past simple.

14.4 Write sentences about yourself using the ideas in brackets.

15.1 Read the situations and write sentences from the words in brackets.

15.2 Read the situations and write sentences ending with before. Use the verb given in brackets.

15.4 Put the verb into the correct form, past perfect (I had done etc.) or past simple (I did etc.).

16.1 Read the situations and make sentences from the words in brackets.

16.2 Read the situations and complete the sentences.

16.3 Put the verb into the most suitable form, past continuous (I was doing), past perfect (I had done) or past perfect continuous (I had been doing).

17.1 Write negative sentences with have. Some are present (can't) and some are past (couldn't).

17.2 Complete these questions with have. Some are present and some are past.

17.3 In this exercise you have to write sentences about yourself. Choose four of the following things (or you can choose something else):

17.4 Complete these sentences. Use an expression from the list and put the verb into the correct form where necessary.

18.2 Brian changed his lifestyle. He stopped doing some things and started doing other things:

18.3 Compare what Carol said five years ago and what she says today:

19.1 A friend of yours is planning to go on holiday soon. You ask her about her plans. Use the words in brackets to make your questions.

19.2 Tom wants you to visit him but you are very busy. Look at your diary for the next few days and explain to him why you can't come.

19.3 Have you arranged to do anything at these times? Write (true) sentences about yourself.

19.4 Put the verb into the more suitable form, present continuous or present simple.

20.1 Answer the questions. You are going to do all these things but you haven't done them yet. Use going to and the word(s) in brackets.

20.2 Write a question with going to for each situation.

20.3 Read the situations and complete the dialogues. Use going to.

20.4 What is going to happen in these situations? Use the words in brackets.

21.2 Read the situations and write sentences with I think I'll ... Or I don't think I'll ...

21.3 Which is correct? (If necessary, study Units 19-20 first.)

21.4 What do you say in these situations? Write sentences with shall I ...? or shall we ...?

22.1 Which form of the verb is correct (or more natural) in these sentences? The verbs are underlined.

22.3 Put in will ('ll) or won't.

22.4 Where will you be at these times? Write true sentences about yourself. Use one of these:

23.1 Complete the sentences using will ('ll) or going to.

23.2 Read the situations and complete the sentences using will ('ll) or going to.

24.1 Read about Colin. Then you have to tick (V) the sentences which are true. In each group of sentences at least one is true.

24.2 Put the verb into the correct form, will be (do)ing or will have (done).

25.1 Complete these sentences using the verbs in brackets. All the sentences are about the future. Use will/won't or the present simple (I see/he plays/it is etc.).

25.2 Make one sentence from two.

25.3 Read the situations and complete the sentences.

25.4 Put in when or if.

26.1 Complete the sentences using can or (be) able to. Use can if possible; otherwise use (be) able to.

26.2 Write sentences about yourself using the ideas in brackets.

26.4 Complete the answers to the questions with was/were able to.

26.5 Complete the sentences using could, couldn't or was/were able to.

27.1 Answer the questions with a suggestion. Use could.

27.2 Put in can or could. Sometimes either word is possible.

27.4 Read this information about Ken:

28.1 Put in must or can't.

28.2 Complete the sentences with a verb in the correct form.

28.3 Read the situations and use the words in brackets to write sentences with must have and can't have.

29.1 Write these sentences in a different way using may or might.

29.2 Complete the sentences with a verb in the correct form.

29.3 Read the situations and make sentences from the words in brackets. Use may or might.

29.4 Complete the sentences using might not or couldn't.

30. Write sentences with may or might.

30.4 Write sentences with may not or might not.

30.5 Read the situations and make sentences with may/might as well.

31.1 Complete these sentences with must or have to (in the correct form). Sometimes it is possible to use either; sometimes only have to is possible.

31.2 Make questions with have to.

31.4 Complete these sentences with mustn't or don't/doesn't have to.

32.2 Complete the sentences with must, mustn't or needn't.

32.3 Read the situations and make sentences with needn't have.

32.4 Write two sentences for each situation. Use needn't have in the first sentence and could have in the second (as in the example). For could have see Unit 27.

33.2 Read the situations and write sentences with I think/I don't think ... Should...

33.4 Read the situations and write sentences with should/shouldn't. Some of the sentences are past and some are present.

34.1 Write a sentence (beginning in the way shown) that means the same as the first sentence.

34.2 Are these sentences right or wrong?

34.4 Complete these sentences using if ... Should... .

35.1 Complete the sentences. Sometimes you need only one word, sometimes two.

35.2 Read the situations and write sentences with had better. Use the words in brackets.

35.3 Put in had better or should. Sometimes either is possible.

35.4 Read the situations and write sentences with It's time (somebody did something).

36.1 Read the situations and write questions beginning Can ... Or Could ...

36.2 Read the situations and write questions beginning Do you think ...

36.3 What would you say in these situations?

37.1 Put the verb into the correct form.

37.2 You ask a friend questions. Use What would you do if ...?

37.3 Answer the questions in the way shown.

37.4 Use your own ideas to complete these sentences.

38.1 Put the verb into the correct form.

38.2 Write a sentence with If ... For each situation.

38.3 Write sentences beginning I wish ...

38.4 Write your own sentences beginning I wish ...

39.1 Put the verb into the correct form.

39.2 Write a sentence with if for each situation.

39.3 Imagine that you are in these situations. For each situation, write a sentence with I wish ...

40.2 Write sentences using promised.

40.3 What do you say in these situations? Write sentences with I wish ... Would ...

40.4 Are these sentences right or wrong? Correct the ones that are wrong.

40.5 These sentences are about things that often happened in the past. Complete the sentences using

41.1 Complete the sentences using one of these verbs in the correct form:

41.2 Write questions using the passive. Some are present and some are past.

41.3 Put the verb into the correct form, present simple or past simple, active or passive.

41.4 Rewrite these sentences. Instead of using 'somebody/they/people' etc. Write a passive sentence.

42.1 What do these words mean? Use it can ... Or it can't... . Use a dictionary if necessary.

42.2 Complete these sentences with one of the following verbs (in the correct form):

42.3 Rewrite these sentences. Instead of using 'somebody' or 'they', write a passive sentence.

42.4 Make sentences from the words in brackets. Sometimes the verb is active, sometimes passive. (This exercise also includes the past simple--see Unit 41 c.)

43.1 When were they born? Choose five of these people and write a sentence for each. (Two of them were born in the same year.)

43.2 Write these sentences in another way, beginning in the way shown.

44.1 Write these sentences in another way, beginning as shown. Use the underlined word in your sentence.

44.2 People say a lot of things about Arthur. For example:

45.1 Tick (V) the correct sentence, (a) or (b), for each picture.

45.2 Why did you do these things? Answer using 'have something done'. Use one of these verbs:

45.3 Write sentences in the way shown.

45.4 Use the words in brackets to complete the sentences. Use the structure 'have something done'.

45.5 Now you have to use 'have something done' with its second meaning (see Section c).

46.1 Yesterday you met a friend of yours, Charlie. Here are some of the things Charlie said to you:

46.2 Somebody says something to you which is the opposite of what they said before. Write a suitable answer beginning I thought you said ....

47.1 Here are some things that Ann said to you:

47.2 Complete the sentences with say or tell (in the correct form). Use only one word each time.

47.3 (Section c) The following sentences are direct speech:

48.1 Ask Liz questions. (Look at her answers before you write the questions.)

48.2 Make questions with who or what.

48.3 Put the words in brackets in the correct order. All the sentences are questions.

48.4 Write negative questions from the words in brackets. In each situation you are surprised.

49.1 Make a new sentence from the question in brackets.

49.2 You are making a phone call. You want to speak to Sue but she isn't there. Somebody else answers the phone. You want to know three things:

49.3 You have been away for a while and have just come back to your home town. You meet Gerry, a friend of yours. He asks you a lot of questions:

50.1 Complete the sentences with an auxiliary verb (do/was/could/should etc.). Sometimes the verb must be negative (don't/wasn't etc.).

50.2 You never agree with Sue. Answer in the way shown.

50.3 You are talking to Tina. Write true sentences about Yourself. Reply with So ... Or Neither... If suitable. Study the two examples carefully.

50.4 In these conversations, you are b. Read the information in brackets and then answer with I think so, I hope not etc.

51.1 Put a question tag on the end of these sentences.

51.2 Read the situation and write a sentence with a question tag. In each situation you are asking your friend to agree with you.

52.1 Complete each sentence with one of these verbs:

1.1 Regular verbs

1.2 Irregular verbs

1.3 The following verbs can be regular or irregular:

1.4 List of irregular verbs

2. Choose the right alternative.

4. Use your own ideas to complete b's sentences.

5. Put the verb in the correct form, past simple (I did), past continuous (I was doing), past perfect (I had done) or past perfect continuous (I had been doing).

7. Put the verbs into the correct form.

8. Put the verb into the most suitable form.

9. Complete the sentences using the past continuous (was doing) or used to ... Use the verb in brackets.

10. What do you say to your friend in these situations? Use the words given in brackets. Use the present continuous (I am doing), going to... Or will (I'll).

11. Put the verb into the most suitable form. Use a present tense (simple or continuous), will (I'll) or shall.

12. Put the verbs in the most suitable form. Sometimes there is more than one possibility.

13. Put the verb into the correct form. Choose from the following:

15. Make sentences from the words in brackets.

16. Put the verb into the correct form.

17. Complete the sentences.

18. Use your own ideas to complete these sentences.

19. Put the verb into the correct form.

20. Put the verb into the most suitable passive form.

21. Put the verb into the correct form, active or passive.

22. Read these newspaper reports and put the verbs into the most suitable form.

23. Put the verb into the correct form.

24. Make sentences from the words in brackets.

25. Complete the second sentence so that the meaning is similar to the first.

26. Put in a/an or the where necessary. Leave an empty space (-) if the sentence is already complete.

27. Choose the right alternative.

28. Put in one of the following prepositions: at on in for since during by until

29. Put in the missing preposition.

30. Put in the missing preposition.

31. Put in a preposition where necessary. If the sentence is already complete, leave an empty space (-).

Study guide

If you are not sure which is right

Key to exercises

Key to study guide(see page 301)

24.1 Read about Colin. Then you have to tick (V) the sentences which are true. In each group of sentences at least one is true.

Colin goes to work every day. He leaves home at 8 o'clock and arrives at work at about 8.45. He starts work immediately and continues until 12.30 when he has lunch (which takes about half an hour). He starts work again at 1.15 and goes home at exactly 4.30. Every day he follows the same routine and tomorrow will be no exception.

1. At 7.45

a. he'll be leaving the house

b. he'll have left the house

c. he'll be at home (V)

d. he'll be having breakfast (V)

2. At 8.15

a. he'll be leaving the house

b. he'll have left the house

c. he'll have arrived at work

d. he'll be arriving at work

3. At 9.15

a. he'll be working

b. he'll start work

c. he'll have started work

d. he'll be arriving at work

4. At 12.45

a. he'll have lunch

b. he'll behaving lunch

c. he'll have finished his lunch

d. he'll have started his lunch

5. At 4 o'clock

a. he'll have finished work

b. he'll finish work

c. he'll be working

d. he won't have finished work

6. At 4.45

a. he'll leave work

b. he'll be leaving work

c. he'll have left work

d. he'll have arrived home

24.2 Put the verb into the correct form, will be (do)ing or will have (done).

1. Don't phone me between 7 and 8. We'll be having (we/have) dinner then.

2. Phone me after 8 o'clock. --- (we/finish) dinner by then.

3. Tomorrow afternoon we're going to play tennis from 3 o'clock until 4.30. So at 4 o'clock, --- (we/play) tennis.

4. A: Can we meet tomorrow afternoon?

B: Not in the afternoon. --- (I/work).

5. B has to go to a meeting which begins at 10 o'clock. It will last about an hour.

A: Will you be free at 11.30?

B: Yes, --- (the meeting/finish) by that time.

6. Tom is on holiday and he is spending his money very quickly. If he continues like this, --- (he/spend) all his money before the end of his holiday.

7. Chuck came to Britain from the USA nearly three years ago. Next Monday it will be exactly three years. So on Monday, --- (he/be) in Britain for exactly three years.

8. Do you think --- (you/still/do) the same job in ten years' time?

9. Jane is from New Zealand. She is travelling around Europe at the moment. So far she has travelled about 1,000 miles. By the end of the trip, --- (she/travel) more than 3,000 miles.

10. If you need to contact me, --- (I/stay) at the Lion Hotel until Friday.

11. A: --- (you/see) Laura tomorrow?

B: Yes, probably. Why?

A: I borrowed this book from her. Can you give it back to her?

Unit 25. When I do/When I've done When and if

A. Study these examples:

A: What time will you phone me tomorrow?

B: I'll phone you when I get home from work.

'I'll phone you when I get home from work' is a sentence with two parts:

the main part: 'I'll phone you'

and the when-part: 'when I get home from work (tomorrow)'

The time in the sentence is future ('tomorrow') but we use a present tense (get) in the when part of the sentence.

We do not use will in the when-part of the sentence:

* We'll go out when it stops raining. (not 'when it will stop')

* When you are in London again, you must come and see us. (not 'when you will be')

* (said to a child) What do you want to be when you grow up? (not 'will grow')

The same thing happens after: while before after as soon as until or till

* I'm going to read a lot of books while I'm on holiday. (not 'while I will be')

* I'm going back home on Sunday. Before I go, I'd like to visit the museum.

* Wait here until (or till) I come back.

B. You can also use the present perfect (have done) after when/after/until/as soon as:

* Can I borrow that book when you've finished it?

* Don't say anything while Ian is here. Wait until he has gone.

It is often possible to use the present simple or the present perfect:


* I'll come as soon as I finish. or I'll come as soon as I've finished.

* You'll feel better after you have something to eat. or You'll feel better after you've had something to eat.

But do not use the present perfect if two things happen together. The present perfect shows that one thing will be complete before the other (so the two things do not happen together).

Compare:

* When I've phoned Kate, we can have dinner. (= First I'll phone Kate and after that we can have dinner.)

but * When I phone Kate this evening, I'll invite her to the party. (not 'when I've phoned') (In this example, the two things happen together.)

C. After if, we normally use the present simple (if I do/if I see etc.) for the future:

* It's raining hard. We'll get wet if we go out. (not 'if we will go')

* Hurry up! If we don't hurry, we'll be late.

Compare when and if:

We use when for things which are sure to happen:

* I'm going shopping this afternoon. (for sure) When I go shopping, I'll buy some food.

We use if (not 'when') for things that will possibly happen:

* I might go shopping this afternoon. (it's possible) If I go shopping, I'll buy some food.

* If it is raining this evening, I won't go out. (not 'when it is raining')

* Don't worry if I'm late tonight. (not 'when I'm late')

* If they don't come soon, I'm not going to wait. (not 'when they don't come')

EXERCISES


25.1 Complete these sentences using the verbs in brackets. All the sentences are about the future. Use will/won't or the present simple (I see/he plays/it is etc.).

1. I'll phone (phone) you when I get (get) home from work.

2. I want to see Margaret before she --- (go) out.

3. We're going on holiday tomorrow. I --- (tell) you all about it when we --- (come) back.

4. Brian looks very different now. When you --- (see) him again, you --- (not/recognise) him.

5. We must do something soon before it --- (be) too late.

6. I don't want to go without you. I --- (wait) until you --- (be) ready.

7. Sue has applied for the job but she isn't very well qualified for it. I --- (be) surprised if she --- (get) it.

8. I'd like to play tennis tomorrow if the weather --- (be) nice.

9. I'm going out now. If anybody --- (phone) while I --- (be) out, can you take a message?

25.2 Make one sentence from two.

1. You will be in London again. You must come and see us then.

You must come and see us. when you are in London again.

2. I'll find somewhere to live. Then I'll give you my address.

I --- when ---

3. I'll do the shopping. Then I'll come straight back home.

--- after ---

4. It's going to start raining. Let's go home before that.

--- before ---

5. She must apologise to me first. I won't speak to her until then.

--- until ---

25.3 Read the situations and complete the sentences.

1. A friend of yours is going to visit London. You want to know where she is going to stay.

You ask: Where are you going to stay when _you are in London?_

2. A friend of yours is visiting you. She has to go soon but maybe there's time for a cup of tea.

You ask: Would you like a cup of tea before ---?

3. Your friend is reading the newspaper. You'd like it after her.

You ask: Can I have the newspaper when ---?

4. You want to sell your car. Jim is interested in buying it but he hasn't decided yet.

You ask: Can you let me know as soon as ---?

5. There are serious traffic problems in your town but they are building a new road.

You say: I think it will be better when ---.

25.4 Put in when or if.

1. Don't worry _if_ I'm late tonight.

2. Tom might phone while I'm out this evening. --- he does, can you take a message?

3. I'm going to Rome next week. --- I'm there, I hope to visit a friend of mine.

4. I think Jill will get the job. I'll be very surprised --- she doesn't get it.

5. I'm going shopping. --- you want anything, I can get it for you.

6. I'm going away for a few days. I'll phone you --- I get back.

7. I want you to come to the party but --- you don't want to come, that's all right.

8. We can cat at home or, --- you prefer, we can go to a restaurant.

Unit 26. Can, could and (be) able to

A. We use can to say that something is possible or that somebody has the ability to do something.

* We use can + infinitive (can do/can see etc.):

* We can see the lake from our bedroom window.

* Can you speak any foreign languages?

* I can come and see you tomorrow if you like.

The negative is can't (= cannot):

* I'm afraid I can't come to the party on Friday.

B. (Be) able to ... is possible instead of can, but can is more usual:

* Are you able to speak any foreign languages?

But can has only two forms, can (present) and could (past). So sometimes it is necessary to use (be) able to... Compare:

* I can't sleep.

but I haven't been able to sleep recently. (can has no present perfect)

* Tom can come tomorrow.

but Tom might be able to come tomorrow. (can has no infinitive)

C. Could and was able to...

Sometimes could is the past of can. We use could especially with:

see hear smell taste feel remember understand

* When we went into the house, we could smell burning.


* She spoke in a very low voice, but I could understand what she said.

We also use could to say that somebody had the general ability or permission to do something:

* My grandfather could speak five languages.

* We were completely free. We could do what we wanted. (= we were allowed to do ...)

We use could for general ability. But if we are talking about what happened in a particular situation, we use was/were able to... or managed to... (not could):

* The fire spread through the building quickly but everybody was able to escape.

or ... everybody managed to escape. (but not 'could escape')

* They didn't want to come with us at first but we managed to persuade them.

or ... we were able to persuade them. (but not 'could persuade')

Compare:

* Jack was an excellent tennis player. He could beat anybody. he had the general ability to beat anybody)

but

* Jack and Alf had a game of tennis yesterday. Alf played very well but in the end Jack managed to beat him. or ... was able to beat him. (= he managed to beat him in this particular game)

The negative couldn't (could not) is possible in all situations:

* My grandfather couldn't (could not) is possible in all situations

* We tried hard but we couldn't persuade them to come with us.

* Alf played well but he couldn't beat Jack.

EXERCISES


26.1 Complete the sentences using can or (be) able to. Use can if possible; otherwise use (be) able to.

1. George has travelled a lot. He _can_ speak four languages.

2. I haven't _been able to_ sleep very well recently.

3. Sandra --- drive but she hasn't got a car.

4. I can't understand Martin. I've never --- understand him.

5. I used to --- stand on my head but I can't do it now.

6. I can't see you on Friday but I --- meet you on Saturday morning.

7. Ask Catherine about your problem. She might --- help you.

26.2 Write sentences about yourself using the ideas in brackets.

1. (something you used to be able to do) I used to be able to sing well.

2. (something you used to be able to do) I used ---

3. (something you would like to be able to do) I'd ---

4. (something you have never been able to do) I've ---

26.3 Complete the sentences with can/can't/could/couldn't + one of these verbs:

come cat hear run sleep wait

1. I'm afraid I _can't come_ to your party next week.

2. When Tim was 16, he was a fast runner. He --- 100 meters in 11 seconds.

3. Are you in a hurry?' 'No, I've got plenty of time. I ---.'

4. I was feeling sick yesterday. I --- anything.

5. Can you speak up a bit? I --- you very well.

6. 'You look tired.' 'Yes, I --- last night,'

26.4 Complete the answers to the questions with was/were able to.

1 A: Did everybody escape from the fire?

B: Yes. Although the fire spread quickly, everybody _was able to escape._

2 A: Did you have difficulty finding Ann's house?

B: Not really. Ann had given us good directions and we ---

3. A: Did you finish your work this afternoon?

B: Yes. There was nobody to disturb me, so ---

4. A: Did the thief get away?

B: Yes. No one realised what was happening and the thief ---

26.5 Complete the sentences using could, couldn't or was/were able to.

1. My grandfather was a very clever man. He _could_ speak five languages.

2. I looked everywhere for the book but I _couldn't_ find it.

3. They didn't want to come with us at first but we _were able to_ persuade them.

4. Laura had hurt her leg and --- walk very well.

5. Sue wasn't at home when I phoned but I --- contact her at her office.

6. I looked very carefully and I --- see a figure in the distance.

7. I wanted to buy some tomatoes. The first shop I went to didn't have any but I --- get some in the next shop.

8. My grandmother loved music. She --- play the piano very well.

9. A girl fell into the river but fortunately we --- rescue her.

10. I had forgotten to bring my camera so I --- take any photographs.

UNIT 27 Could (do) and could have (done)

A. We use could in a number of ways. Sometimes could is the past of can (see Unit 26C):

* Listen. I can hear something. (now)

* I listened. I could hear something. (past)

But could is not only used in this way. We also in the future (especially to make a suggestion). For example:

* A: What shall we do this evening?

B: We could go to the cinema.

* It's a nice day. We could go for a walk.

* When you go to New York next month, you could stay with Barbara.

* A: If you need money, why don't you ask Karen?

B: Yes, I suppose I could.

Can is also possible in these sentences ('We can go for a walk,' etc.). Could is less sure than can. You must use could (not 'can') when you don't really mean what you say. For example:

* I'm so angry with him. I could kill him! (not 'I can kill him')

B. We also use could to say that something is possible now or in the future:

* The phone is ringing. It could be Tim.

* I don't know when they'll be here. They could arrive at any time.

Can is not possible in these examples (not 'It can be Tim')

In these sentences could is similar to might (see Unit 29-30):