例:①If you will listen,I’ll tell you.
②If we are to finish the work on time,we’ll have to work hard.
(2) be to do表将来。
①表计划、安排即将发生的事,常见于报刊、广播,用于宣布官方的计划、决定。
Where are we to stay tonight?
The Queen is to visit China next year.
②表命令,禁止,必须(不得不)。
You are to finish your work before supper.
③用于第一人称,表征求对方意见。
Are we to go on with this work?
④可用于条件句表将来。
If we are to be there before ten,we’ll have to go now.
(3)be doing表将来,表计划、安排即将发生的动作,常用表示位置移动的词:go,
come,leave,start,arrive,return等以及die,marry等。
①What are you doing tonight?
②We are starting the work in a few days.
(4)be going to表将来。
①表计划、安排好的即将发生的动作。
How long is he going to stay here?
②根据迹象表明将要发生的动作。
It is going to rain.
She is going to have a baby.
(5) shall/will表将来。
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