if引导的是什么从句？
if句又叫条件句，表示“假如”，是状语从句的一种，是一种非常常见的从句形式，用来提出一种与客观现实不相符或根本不可能存在的条件，拥有三种形式。
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
eg. 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
eg. 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
eg. 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。
总结一下，也就是说：
与现在事实相反，虚拟语气的条件从句的谓语用过去式。如:If I knew her number I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。
与过去事实相反，虚拟语气的条件从句的谓语用过去完成时。如:If I'd left sooner，I'd have been on time. 要是我早点动身，我就准时到了。
与将来事实相反，条件从句的谓语用过去式。如:If he went，would you go too? 如果他去，你也去吗?
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