一、as if 从句的作用
1.在look,seem等系动词后引导表语从句。
She looks as if she were ten years younger.
她看起来好像年轻了十岁。
2.引导方式状语从句
She loves the boy as if he were he father.
她爱这个男孩,就好像他是她的父亲一样。
二、as if还可用于省略句
如果as if引导的从句是“主语+系动词”结构,可省略主语和系动词,这样as if后就只剩下名词、不定式、形容词(短语)、介词短语或分词。
He acts as if (he were)a fool.
他做事像个傻子。
She left the room hurriedly as if (she were)angry.
她匆忙离开房间好像生气的样子。