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來源：網絡資源 2023-01-09 15:48:59
助動詞be(am, is, are, was, were, being, been)的用法
(1) be后跟現在分詞構成進行時態(tài)。
Who is playing the violin?誰在拉小提琴?
She was reading a book then.那時她正在讀書。
(2)be后跟過去分詞構成被動語態(tài)。
He was asked to do the work.有人要他干這件工作。
You are invited to attend the meetintg.有人邀請你參加會議。
(3)be 后跟不定式作謂語，有如下幾種情況：
①表示計劃、安排將要發(fā)生的事。
Who are we to meet?我們要見誰呀?
I'm to have supper with John this afternoon.今天下午我要與約翰一起吃晚飯。
②表示指示、命令，否定式表禁止。
You are to see the headmaster today.今天你必須去見校長。
You are not to enter the room without permission.未經允許你不能進入房間。
③表示義務、責任等，同should。You are to be back before 5.你得在5點鐘以前回來。
What is to be done?該干什么。
④表示可能性，與情態(tài)動詞may, can同義。
Such books are to be found in any library.這種書任何圖書館都有。
Not a sound was to be heard.一點聲響也沒有。
⑤表示后來發(fā)生的事，可以用來表示命運或注定
They say good-bye, little knowing that they were never to meet again.他們告別了，沒想到再也不能相見了。He was to regret the decision.他有一天會后悔做出這一決定的。
⑥用于習語
Where am I to go? 我該向何處去?
What am I to do? 我該怎么辦?
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