if的虚拟语气用法 if三大虚拟语气公式

【if的虚拟语气用法 if三大虚拟语气公式】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 。

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