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    表示与现在事实相反的情况时, if从句的谓语用动词的过去式 (be动词的过去式多用were, 而不用was), 主句的谓语用should / would / could / might +动词原形 (should多用于第一人称, would多用于二三人称, could / might可用于所有人称) a. If I had more time, I should study computer better. b. If he were not so busy, she would attend the meeting this afternoon. c. If they didn’t take exercises every day, they wouldn’t be so healthy. d. If you went to bed earlier, you would not be so sleepy in the morning. e. If she invited me, I should go to the party. 【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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