Andy's Home 不详 2007-8-23 22:32:17

1． 违背现在事实的假设：

If the earth had no gravity, the moon would fly o the sun.

If I were/was you, I would reconsider their proposal.

If he were/was you, everything would be all right.

What would you do if you were in his position?

If it weren’t/wasn’t raining, we wouldn’t stay indoor.

If the manager were/was here, he might make a decision.

2. 违背过去事实的假设

If I had left a little earlier, I would have caught the train.

If she hadn’t taken your advice, she would have made a bad mistake.

She would have come if she hadn’t been so busy.

I could have done it better if I had been more careful.

If he hadn’t been ill, he might have come.

3. 可能违背将来事实的假设 这里指的是将来不大可能发生的假设，或者虽有可能发生，但说话人主观上不希望发生的假设。