1． as if 从句的作用
as if一般可由as though来代替。可在look, seem等系动词后引导表语从句。如：
He looked as if / though he was ill. 他看起来好像生病了。
It seems as if it is going to rain.
看来好像要下雨了。
它还可引导方式状语从句。如：
I remember the whole thing as if / though it happened yesterday.
我记得整个事情，就好像它是发生在昨天一样。
The child talked to us as if he were a grown?鄄up.
那个小孩跟我们讲话就像个大人一样。
