4.conditional sentences (past). you have to put the verb into the correct form. 1) if i (know) that you were ill last week, i`d have gone to see you. 2) tom (not / enter) for the examination if he had known that it would be so difficult. 3) it`s good that ann reminded me about tom`s birthday. i (forget) if she hadn`t reminded me. 4) i`d have sent you a post card while i was on holiday if
i (have) your address. 5) we might not have stayed at this hotel if george (not / recommend) it to us. 5.conditional sentences (present). 1) if i (know) her number, i would telephone her. 2) i (not / buy) that coat if i were you. 3) i (give) you a cigarette if i had one but i`m afraid i haven`t. 4) if you (not / go) to bed so late every night, you wouldn`t be so tired all the time. 5) i
wouldn`t mind living in england if the weather (be) better.

1. Had known

2. Wouldn't have entered

3. Would have forgotten

4. Had had

5. Had not recommended 

1. Knew

2. Wouldn't buy

3. Would give

4. Didn't go

5. Was

1) If I had known that you were ill last week, I`d have gone to see you. 2) Tom wouldn't have entered for the examination if he had known that it would be so difficult. 3) It`s good that Ann reminded me about Tom`s birthday. I would have forgotten if she hadn`t reminded me. 4) I`d have sent you a post card while I was on holiday if I had had your address. 5) We might not have stayed at this hotel if George hadn't recommended it to us.

1) If I knew her number, I would telephone her. 2) I wouln't buy that coat if I were you. 3) I would give you a cigarette if I had one but I`m afraid I haven`t. 4) If you didn't go to bed so late every night, you wouldn`t be so tired all the time. 5) I wouldn`t mind living in England if the weather was better.