例：If it should rain tomorrow,don't expect me./I would not go there.

1、表示与现在事实相反。If I were you, I would try it。如果我是你，我会试试的。2、与过去事实相反。If he had realized that, he would have run away while there was still time。如果他意识到这一点，他就...

（1）If I had got there earlier，I should/could have met her.如果我早到那儿，我就会见到她。（事实：去晚了）。（2）If he had taken my advice，he would not have made such a mistake.如果他听我的劝告的...

If you had taken my advice then,you would not be in trouble now.如果当时听我的劝，你现在就不会有麻烦了。(if 条件句是对过去的虚拟，故用过去完成时，而主句是对现在的虚拟，故用“would+动词原形”形式）2、...

if的省略：在正式文体中，有时可把虚拟条件句中的连词if省去，这时从句需要采用倒装语序，即：将were,had,should等助动词提到主语前面，主句不做任何变化。例句：should it rain tomorrow,we would staly at home.错综时间...

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 ...

(1) 将来时的条件句中的虚拟语气.如：If he should go to Qing Hua University,he would make full use of his time.如果他要上清华大学的话,他就会充分利用他的时间了.If he were to come here,he would tell ...

1、if 引导的条件状语从句有两种语气，一种是真实语气，一种是虚拟语气。 2、if条件句中如有were，should，had，可以省去if，并使用倒装语序。3、在语法中if条件状与从句中的谓语动词如果是be其过去形式一般用were。

虚拟语气在非真实条件状语从句中的用法及动词形式 ① 表示与现在事实相反的情况 （条件）从句谓语动词形式 主句谓语动词形式 谓语动词用一般过去式 （be用were） should/would/could/might+动词原形（过去将来时）eg.If I ...