助动词be的用法与例句

动词助动词复合谓语不定式评论

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。
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。

此外还可以不定式构成复合谓语表示打算做或应该的事：
Where are we to meet?
我们在哪里碰头?
Who is to pay?
谁付?
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。