9 stayed - had lived

10 sat - were being repaired

11 turned - went - had forgotten

12 has changed - came

5 found - had just left

6 arrive - will probably be raining

7 raining - stops

8 were watching - failed

1 has been lying - haven't read

2 have you been - spent

3 have never met - looks

4 will be - comes

22 If you don't save electricity, you'll pay much per month

23 If it is fine, we will go on a picnic tomorrow

24 If I were you, I would have my room redecorated

19 Unless you train harder, you won't break her past record

20 If you don't hurry, you will miss the last train

21 If you watch too much TV, you won't be healthy

9 If the house weren't so expensive, I could buy it

10 If it weren't so dark, I could see something

11 Unless you are punctual, you will be late for the meeting

12 If you are lazy, you will fail the exam again

5 If it is fine, we will go on a picnic tomorrow

6 If I were you, I would have my room redecorated

7 If I weren't so busy, I would write to my friends

8 If the tea weren't so hot, I could drink it

1 Unless you train harder, you won't break her past record

2 If you don't hurry, you will miss the last train

3 If you watch too much TV, you won't be healthy

4 If you don't save electricity, you'll pay much per month

5 Jim runs faster than David does

David doesn't run as fast as Jim (does)

6 That apartment is more expensive than this one

That apartment isn't as cheap as this one

7 Reading books is more boring than watching films

Reading books isn't so interesting as watching films

8 That exercise is more difficult than this one

That exercise isn't as easy as this one

18 B

19 B

20 A

21 A

22 C