Unit 24

24.1

2 b is true

3 a and c are true

4 b and d are true

5 c and d are true

6 c is true

24.2

2 We'll have finished

3 we'll be playing

4 I'll be working

5 the meeting will have finished

6 he'll have spent

7 he'll have been

8 you'll still be doing

9 she'll have travelled

10 I'll be staying

11 Will you be seeing

UNIT 25

25.1

2 goes

3 will tell/'ll tell... come

4 see... won't recognise/will not recognise

5 is/'s

6 will wait/'ll wait... are/'re

7 will be/'ll be... gets

8 is

9 phones... am/'m

25.2

2 I'll give you my address when I find somewhere to live. or... when I've found somewhere to live.

3 I'll come straight back home after I do the shopping. or... after I've done the shopping.

4 Let's go home before it starts raining.

5 I won't speak to her until she apologises. or... until she has apologised.

25.3

2 you leave/you go

3 you finish with it/when you finish reading it or you've finished with it you've finished reading it you've read it

4 you decide/you've decided

5 they finish the new road or they've finished the new road or they've built the new road

25.4

2 If 3 When 4 if

5 If 6 when 7 if 8 if

UNIT 26

26.1

3 can

4 been able to

5 be able to

6 can

7 be able to

26.2 Example answers:

2 I used to be able to run fast.

3 I'd like to be able to play a musical instrument.

4 I've never been able to get up early.

26.3

2 could run

3 can wait

4 couldn't eat

5 can't hear

6 couldn't sleep

26.4

2 were able to find it.

3 I was able to finish it.

4 was able to get away.

26.5

4 couldn't/wasn't able to

5 was able to

6 could/was able to

7 was able to

8 could/was able to

9 were able to

10 couldn't/wasn't able to

UNIT 27

27.1

2 We could have fish.

3 You could give her a book.

4 You could phone her now.

5 We could go (and see him) on Friday.

6 We could hang it in the kitchen.

27.2

2 could 3 can/could

4 could 5 could

6 can 7 can/could 8 could

27.3

2 could have gone

3 could apply

4 could have gone

5 could come

27.4

2 Ken couldn't have gone out (for a meal) on Friday evening (because he had to work).

3 Ken could have played tennis on Monday afternoon.

4 He couldn't have lent Jack L50 (because he was short of money). or He couldn't have lent him L50.

5 He could have come to Jane's party. or He could have gone to.

6 He couldn't have repaired her washing machine (because he doesn't know anything about machines).

UNIT 28

28.1

2 must 3 can't

4 must 5 can't

6 must 7 must 8 can't

28.2

3 be

4 have been

5 be

6 go or have been

7 be going

8 have taken/have stolen

9 have been

10 be following

28.3

3 It must have been very expensive.

4 They must have gone away.

5 I must have left it in the restaurant last night.

6 The exam can't have been very difficult.

7 She must have been listening to our conversation./She must have listened to.

8 She can't have understood what I said.

9 I must have forgotten to turn it off.

10 The driver can't have seen the red light.

11 The neighbours must have been having a party.