Exercise I
1/ had
2/ would have visited
3/ attended
4/ knew
5/ had arrived
6/ studies
7/ doesn't hurry
8/ see
9/ had spoken
10/ would you do
Exercise II
1/will be
2/ would come
3/ rang
4/ would have fed
5/ didn't rain
6/ was
7/ would have written
8/ had played......... would have won
10/ did
12/ would build
13/ gives
14/ wouldn't have had
15/ had written
16/ improved
17/ had
18/ would have visited
19/ attended
20/ knew
21/ had arrived
22/ studies
23/ doesn't hurry
24/ see
25/ had spoken
26/ would you do
Exercise III
1/ We won't go out if it doesn't stop raining
2/ I will call the police if you don't give back my bicycle
3/ You wouldn't be able to do this exercise if your English weren't good
4/ If we didn't have enough rain, we couldn't grow rice
5/ The fishermen could't have caught a lot of fish, if they hadn't had good nets
6/ I wouldn't buy it if i couldn't afford it
7/ I would refused to go if the didn't pay my expenses
8/ I don't agree with his economic policy. I wouldn't vote for him if he didn't change it
9/ He wouldn't have written if he hadn't heard news
10/ You might not have a terrible toothache if you went to the dentist regularly.
Exercise IV
1/ If she had a college degree, she could be employed
2/ If I had enough money, I could go on a long holiday this year
3/ If he weren't slow, we would give his such an important task
4/ If I didn't have to work this Sunday, I could join your picnic
5/ If he doesn't work overtime to get more money, he can't pay his father's debt.
6/ If everything weren't very expensive, city life would be enjoyable
7/ If she had learned hard, she wouldn't have got bad mark
8/ If you aren't careful, you will make accidents
9/ If I hadn't forgotten the map, I wouldn't have got lost.
10/ Unless anyone came, we would phone you at once
11/ If their friends had come on time, they wouldn't have been angry.