1) It is late now; I don't think Ann will come to see us

-> I would be surprised if Ann came to see us

2)We don't go on holiday because we don't have enough money

-> If we had enough money, we would go on holiday

3) Do these exercises more carefully or you will fail the exams

-> Unless you do these exercises more carefully, you will fail the exams

4) I do not know the answer so I can not tell you

-> If I knew the answer, I could tell you

5) She can't apply for the job because she doesn't know French

-> If she new French, she could apply for the job

6) if she didn't come here now, we'd come back home

-> Unless she came here now, we'd come back home

7) Be careful or you will not be able to get the job

-> Unless you are careful, you will be able to get the job

8) The tress will die unless it rains soon

-> If it doesn't rains soon, the tress will die