if引导的条件状语从句有过去时吗?一直很纠结在全文为过去时的文章中如何用if引导的条件状语从句.还有,如果有,那么它与if引导的与现在事实相反的虚拟条件句如何区别开?

Question

if引导的条件状语从句有过去时吗?
一直很纠结在全文为过去时的文章中如何用if引导的条件状语从句.还有,如果有,那么它与if引导的与现在事实相反的虚拟条件句如何区别开?

Answer 1

if引导的条件状语从句分真实的条件状语从句和虚拟的条件状语从句,现在说虚拟的条件状语从句.他的固定句式是：与现在事实相反时 if +主语+动词的过去式,主语+would/could/might/should+动词原型.例如if I were you,i would not talk with him.与将来事实相反时 if +主语+动词的过去式/were to do/should do,例如if it rained,we should go out.主语+would/could/might/should+have v.ed(即现在完成时） 与过去事实相反时 if +主语+had v.ed,主+would/could/might/should+have v.ed .例如if you had worked hard,you would have passed the test.