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    表示与将来事实相反的情况时, if从句的谓语形式是: ①.完全动词过去式 ; ②.should +动词原形; ③.were to do. 其中②, ③种情况都含有“出乎意料之外 之意; 主句的谓语的形式是: should / would / could / might +动词原形 a. If she should invite me tomorrow, I should go to the party. b. If it rained / should rain / were to rain tomorrow, our picnic would be put off. c. If I saw him tomorrow, I would pass your note to him. d. I might come back if I were to miss the train. 【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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