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助动词be的用法助动词be的用法 简：助动词be（am, is, are, was, were, being, been）的用法 详：（1） be后跟现在分词构成进行时态。 Who is playing the violin?谁在拉小提琴？ She was reading a book then.那时她正在读书。 （2）be后跟过去分词构成被动语态。 He was asked to do the work.有人要他干这件工作。 You are invited to attend the meetintg.有人邀请你参加会议。 （3）be 后跟不定式作谓语，有如下几种情况： ①表示计划、安排将要发生的事。 Who are we to meet?我们要见谁呀？ I'm to have supper with John this afternoon.今天下午我要与约翰一起吃晚饭。 ②表示指示、命令，否定式表禁止。 You are to see the headmaster today.今天你必须去见校长。 You are not to enter the room without permission.未经允许你不能进入房间。 ③表示义务、责任等，同should。 You are to be back before 5.你得在5点钟以前回来。 What is to be done?该干什么。 ④表示可能性，与情态动词may, can同义。 Such books are to be found in any library.这种书任何图书馆都有。 Not a sound was to be heard.一点声响也没有。 ⑤表示后来发生的事，可以用来表示命运或注定 They say good-bye, little knowing that they were never to meet again.他们告别了，没想到再也不能相见了。 He was to regret the decision.他有一天会后悔做出这一决定的。 ⑥用于习语 Where am I to go?我该向何处去？ What am I to do? 我该怎么办？ 上一篇助动词have的用法下一篇助动词 |
