IF虚拟语气的三种时态是什么
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
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
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
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。
扩展资料
虚拟语气用法：
1、用在含蓄条件句中
句子中，假设的情况不用条件从句表示出来，而是用一个介词短语来表示，句子的谓语形式也可遵循上表的规则。
这种用法也常见于or, or else, otherwise和but后面的分句中。
例如：Without music, the world would be a dull place.
2、用在错综时间条件句中
有时候，条件从句表示的动作和主句表示的动作发生的时间并不一致，这时，谓语动词的形式要根据表示的时间来调整，这种句子可称作错综时间条件句。例如：
If you hadn’t watched television so late, you wouldn’t be so sleepy now.
此句为时间交错的虚拟条件句，从句表示与过去事实相反的假设，主句则假设与现在情况相反
3、用在wish后的宾语从句中
这种句子主要表示愿望，that常省略。若指现在或将来的愿望，从句用过去时;若指过去没有实现的愿望，从句用过去完成时。
例如：I wish I had learned to play chess.(与过去事实相反)
若wish 后的宾语从句中用would，可以表示请求，通常意味着说话人的不快或不满。
例如：I wish you would help us.
4、用在if only感叹句中
当表示“但愿”，“要是…就好”时，它的用法和wish基本相同，只是更富有感情色彩，表示一时很难实现的愿望。
例如：If only I knew what you wanted.
5、用在以as if (as though) 引出的方式状语从句中
当表示过去想象中的动作或情况时，用过去完成时;当表示和现在事实相反或对现在情况有所怀疑时，用一般过去时。
例如：The old couple loved the orphan girl as if she had been their daughter.
6、用在某些虚拟的定语从句中
He was the very person I should have been wished to see.
7、用以表示说话人的主观愿望或选择，仅用在一些惯用句型的从句中
I’d rather they came tomorrow.
但had rather, would rather, would just as soon, would sooner等惯用语如用在简单句中，其后都用不加to的动词不定式。
例如：I’d rather die than give up my principle.
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