说明: 这种用法也可以说成是一种将来时态表达法。
b. 表示命令,例如:
You are to explain this. 对此你要做出解释。
He is to come to the office this afternoon. 要他今天下午来办公室。
c. 征求意见,例如:
How am I to answer him? 我该怎样答复他?
Who is to go there? 谁该去那儿呢?
d. 表示相约、商定,例如:
We are to meet at the school gate at seven tomorrow morning. 我们明天早晨7点在校门口集合。
4 助动词have的用法
1)have +过去分词,构成完成时态,例如:
He has left for London. 他已去了伦敦。
By the end of last month, they had finished half of their work.
上月未为止,他们已经完成工作的一半。
2)have + been +现在分词,构成完成进行时,例如:
I have been studying English for ten years.
我一直在学英语,已达十年之久。
3)have+been +过去分词,构成完成式被动语态,例如:
English has been taught in China for many years.
中国教英语已经多年。
5 助动词do 的用法
1)构成一般疑问句,例如:
Do you want to pass the CET? 你想通过大学英语测试吗?
Did you study German? 你们学过德语吗?
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