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助动词be的用法与例句

I.be作为助动词可以:
1.构成进行时态(be+现在分词)
I am seeing a friend off.
我在给一个朋友送行。
She was telling us a story.
她在给我们讲故事。
He will be leaving tomorrow.
他明天走。
What have you been doing these days?
这些时候你都在干什么?

2.构被动语态(be+过去分词):
These books were published last year.
这些书是去年山版的。
Rice is grown chiefly in the south.
水稻主要在南方种植。
The houses are being rebuilt.
这些房了正在重建。
The plan has been approved.
计划业已批准。

此外还可以和不定式构成复合谓语表示打算做或应该做的事:
Where are we to meet?
我们在哪里碰头?
Who is to pay?
谁付钱?
You’re to be back tonight.
你应今晚回来。
The worst was still to come.
最糟糕的情况还在后头。

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