if虚拟语气用法

1、提出将来会发生的事：

主句：主语＋would/should/might/could＋动词原形；

从句：should＋动词原形/were to＋动词原形。

例句：If he should go to Harvard University, he would make full use of his time.

如果他要上哈佛大学的话，他就会充分利用他的时间了。

扩展资料

主句：主语＋would/should/might/could＋动词原形；

从句：动词过去式。

例句：If he studied at this school, he would know the enviornment around the school very much.

如果他在这所学校学习的'话，他会很了解周边环境。

3、提出过去的未发生的条件：

主句：主语＋would/should/might/could have＋动词过去分词；

从句：had＋动词过去分词。

例句： If I had read the book, I would have told you about it.

我如果看过本书，我会把内容告诉你了。