從句表示與將來事實相反，謂語動詞用“would／could／might＋動詞原形”。

　　例句：

　　You look as if you didn’t care.

　　你看上去好像并不在乎。

　　He talks about Rome as if he had been there before.

　　他說起羅馬來好像他以前去過羅馬似的。

　　He opened his mouth as if he would say something.

　　他張開嘴好像要說什么。