if的虚拟语气用法 if的虚拟语气用法是怎样

莉落

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。

2、提出现在的条件: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。