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    现在进行时 ①表示正在进行的动作, ②表示按计划安排即将发生的动作. She is leaving for Beijing.她要去北京. He is working as a teacher tomorrow.从明天起他要做老师. My father is coming to see me this Saturday.这个星期六我爸爸要来看我. ③代替一般现在时.描绘更加生动. The Changjiang River is flowing into the east.江水滚滚向东流. The sun is rising in the east.太阳从东方冉冉升起. ④与always, forever, constantly, continually连用.表示赞赏或厌恶等感情色彩.但并非强调动作正在进 行, He is always helping others.他总是肯帮助他人. She is always forgetting something.她老是忘记某些事情. ⑤大多数动词可用于进行时.但也有些动词不用于进行时. 常见的有: ▲感觉类:look, smell, feel, sound, taste, see, hear ▲情感类:like, love, prefer, admire, hate, fear ▲心态类:wish, hope, expect, want, need, believe, think, understand, agree, knowt ▲所有类:have, contain, won, hold, belong to等. 【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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