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。
2. 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。
3.助动词do 的用法
1)构成一般疑问句。例如:
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