1. If he hadn't been very lazy, he wouldn't have failed in his exam.
2. If I had had enough money, I would have bought that laptop.
3. If I don't have enough money, I can't buy that expensive dictionary.
4. Unless we do our homework well, the teacher will get angry with us.
5. Unless you keep your feet dry, you will catch a cold.
6. If she had known you were in the hospital, she would have visited you.
7. If you don't water these plants everyday, they will die..

1.He failed in his exam because he was very lazy.

=> If ………… he hadn't been very lazy, he wouldn't have failed in his exam.………………………………………………..

2.I didn’t have enough money, so I didn’t buy that laptop

=> If I had had enough money, I would have bought that laptop.………………………………….

3.I don’t have enough money, I can’t buy that expensive dictionary.

=> If …3. If I don't have enough money, I can't buy that expensive dictionary...

4.We must do our homework well or the teacher will get angry with us.

=> 4. Unless we do our homework well, the teacher will get angry with us.……………………………..

5.You will catch a cold if you don’t keep your feet dry.

=> 5. Unless you keep your feet dry, you will catch a cold.…………………………….

6.She didn’t know you were in hospital, so she didn’t visit you.

=> 6. If she had known you were in the hospital, she would have visited you.……………………

7.Unless you water these plants everyday, they will die

=> 7. If you don't water these plants everyday, they will die.……………………………