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    表示与过去事实相反的情况时, if从句的谓语用had done形式, 主句的谓语用should / would / could / might + have done的形式 a. If she had invited me yesterday, I should have gone to the party. b. I would have checked my paper again if I had had more time at yesterday’s exam. c. If you had taken the teacher’s advice, you would not have failed in the exam. 【查看更多】

     

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    as if和as though引导的从句所叙述的情况与事实相反时，从句的谓语动词多用虚拟语气。在虚拟语气结构中，用________时态来表示现在的情形；用________时来表示过去的动作或状态；用________时表示正在进行的动作；用________时表示将要发生的动作。

    当as if和as though从句的主语和主句主语一致，且从句中含有系动词be的某种形式时该主语和系动词可以省略。

    例如：John paused as if(he was)expecting Mary to speak．

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