b.should+动词原形(不能用would)
c.were to+动词原形 would/could/might/should+动词原形
与现在事实相反
if从句:动词过去式(be---were)
主句:would/could/might/should+动词原形
If we had time, we would go with you.
If I were you, I shouldn’t do that.
If it weren’t raining, we wouldn’t stay.
与过去事实相反
if从句:had done
主句:would/could/might/should+have done
If the teacher hadn’t helped us, we couldn’t have succeeded.
I could have done it better if I had been more careful.
If he hadn’t been ill, he might have come.
3.与将来事实可能相反
if从句:a.动词过去式(be一律用were)
b.should+动词原形(不能用would)
c.were to+动词原形
主句:would/could/might/should+动词原形
If he came tomorrow, I would tell him everything.
If it should rain tomorrow, I would stay at home and watch TV.
If it were to snow tomorrow, they would not go out.
Should he come tomorrow, please give the book to him.
错综时间条件句
在虚拟语气中,有时条件从句动作发生的时间和主句动作发生的时间是不一致的,称为错综时间条件句。这种句子的形式往往要根据句子的时间相调整,分别处理。
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