sa if引导状语从句

sa if引导状语从句
1、在as if引导的状语从句中，用虚拟语气(虚拟语气)的情况是比较多的，动词形式跟wish后的宾语从句中的谓语形式差不多：He acts as if he knew you.
The stuffed dog barked as if it were a real one.
He talks as if he had a potato in his mouth.
She closed her eyes as if she were too tired.
We feel / felt as though we had witnessed the
whole thing.
2、有时虚拟语气并不明显，尤其是主语动词为过去时时:
e.g. She looked a bit queer, as if she knew
something.
He paused as though he found a difficulty.
3、有时从句的谓语也可用陈述语气(indicative / declarative mood)，特别是当主句谓语为look，seem, taste,smell时:
e.g. It looks as if it is going to rain.
It seems as if we shall have to walk.
This meat tastes as if it has already gone bad.
The milk smells as if it is sour.。