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虚拟语气as if的三种用法是什么1、用于表示与现在事实相反的情况。
当在虚拟语气中，asif用来表示与现在事实相反的情况，其从句应该用一般过去时，不过在虚拟语气中，be动词要用were，就算主语是单数，也用were。
例句：
The rest of the application should continue as if nothing happened.
程序其它部份应该可以继续像往常一样运行。
2、用于表示与过去事实相反的情况。其中，从句的结构是主语+had+动词的过去分词。
当as if用于表示与过去事实相反的情况，其从句的结构为主语+had+动词的过去分词形式。
例子：
I suggest that you should stay here as if nothing had happened.
我建议你应该呆在这儿，好像什么事情都没发生。
3、用于表示与将来事实相反。
当as if用于表示与将来事实相反，其从句的结构为主语+would/could/might/should+动词原形。
例句如下：
The lady brisked up to him as if she would fight him.
那妇人向他急急而来，好像要跟他动武似的。
as的固定搭配短语as well as 也;和....一样好;
as long as 只要;长达....之久;
as tall as 和....一样高;
as big as 和....一样大;
as wide as 和....一样宽;
as deep as 和....一样深;
as much as 和....一样多;高达
as far as 远至 ; 就……而言 ; 远到 ; 就;
as clear as day 一清二楚的 ; 明若观火 ; 了如观火 ; 显而易见;
as good as 和…几乎一样 ; 几乎已经 ; 和 ; 不亚于;
as for as 就…而论;
As Early As Possible 尽早 ; 趁早 ; 早早儿 ; 尽快地;
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