句型公式：as if引导表语从句)

　　1as if/though可引导表语从句和状语从句。若表示与现在事实相反的假设，从句谓语动词用过去时；若表示与过去事实相反的情况，从句谓语动词用过去完成时；若表示与将来事实相反，谓语动词用“would/could/might＋动词原形”。

　　2如果as if/though引导的从句所表示的内容与事实相符，则使用陈述语气。

　　3as if/though引导的从句可用省略形式，后面直接跟名词、不定式、形容词、介词短语或分词。

　　(1)It looked as if it had been spray­painted.

　　它看起来好像是喷过漆的。

　　(2)They treat me as if I were a stranger.

　　他们待我如陌生人。

　　(3)He opened his mouth as if he would say something.

　　他张开嘴好像要说什么。

　　多维训练

　　单句语法填空

　　(1)The patient opened his mouth as if to say(say) something.

　　(2)He stared at me as if seeing(see) me for the first time.

　　(3)Jackie looks after his younger sister as if he were(be) an adult.

　　(4)It was John who broke the window.Why are you talking to me as if I had done(do) it?

　　(5)He talks about Hong Kong as if he had been(be) there before.

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