as if 从句可以省略主语和动词 be。给你提供几个《柯林斯高级英语学习词典》上的例句：

Davey sat as if hypnotized by the sound of Nick's voice. 戴维坐在那里，好像被尼克的声音迷住了似的。

They all stood there staring, as if frozen to the spot. 他们都站在那儿发愣，就像被冻在那里似的。

He paused and cocked his head as if listening. 他停顿了一下，歪着头，好像是在听。