当if引导的从句用虚拟语气时.可以把if省去.把从句中的were.had.should等放在从句前面.构成部分倒装. [考例]① fired, your health care and other benefits will not be immediately cut off. A. Would you be B. Should you be C. Could you be D. Might you be [解析]B.根据句意可知.前面应该是一个与将来事实相反的虚拟条件句.构成是should +v.或were to + v..省略if后要使用部分倒装语序.只有B项符合符合要求. ②What would have happened , as far as the river bank? A. Bob had walked farther B. if Bob should walk farther C. had bob walked farther D. if Bob walked farther [解析]C.根据句意可知.这是一个与过去事实相反的虚拟语气的复合句.期构成是:条件状语从句中谓语动词用过去完成时.主句中用would / could /should-+完成时.省略if后使用部分倒装语序.只有C项符合. 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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