as if ，英语词组，可在look, seem等系动词后引导表语从句，表达的是虚拟语气好像、似乎、仿佛的意思。
1．引导表语从句， 常与as,look,seem,feel,taste,smell,sound等系动词连用。
如：
She looks as if she were ten years younger．
她看起来好像年轻了十岁。
It seems as if our team is going to win．
看来我们队要胜了。
It looks as if a tornado swept through your room.
好像有龙卷风席卷过你的房间。
It looks as if they're looking for something.
他们看起来好像在找什么东西。
