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    过去进行时 表示过去某个时间点或某段时间内正在发生的动作. The boy was doing his homework when his father came back from work. He was taking a walk leisurely by the lake when he heard someone shouted for help. What were you doing at nine last night? The radio was being repaired when you called me. 【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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