1.引导方式状语从句.如: She loves the boy as if she were his mother. 她爱这男孩,就好像她是他的母亲一样. The child talked to us as if he were a grownup. 那孩子跟我们谈起话来,像个成年人似的.
2.as if 还可用于省略句中 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.如: He acts as if (he was) a fool. 他做事像个傻子. Tom raised his hands as if (he was going) to say something. 汤姆举起手好像要说什么. She left the room hurriedly as if (she was)angry. 她匆忙离开房间好像生气的样子.