if only 引导虚拟语气时,从句是用什么时态,主句从句时态一致用什么时态。并解释下面这个句子为什么主句从句时态一致不是

as if 从句和虚拟语气
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as&if&从句和虚拟语气
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as if (= as though) 意思是“好像……,仿佛……”,是个连词,引导方式状语从句。例如:
He makes it seem as if it were one of the best meals he has ever had.
关于as if 的用法比较复杂一些,请注意以下几个问题:
1. as if 引导的从句经常用虚拟语气。从上面的句子可以看出,主句都是现在时态,as if从句都是过去时态,这说明as if 从句表示的意思与事实不符或者相反。例如:
He walks as if he were drunk.
My neighbor treats the child as if he were their own son.
2. 但是,如果句子表达的意思与事实并没有什么不符,那么就不使用虚拟语气。例如:
He heard a noise, as if someone was breathing.
It looks as if it is going to rain.
3. as if 经常和look, seem 连用。例如:
She looks as if she is (were) ill, because her face is pale.
It seemed as if there was a fight between the two sides.
4. as if 从句中的主语如果和主句主语相同,而且谓语动词有be, 则从句主语和谓语经常省略。例如:
She stood at the gate as if (she was) waiting for someone.
The teacher shouted at the boy as if (he was) angry.
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