Constructions with 'is to do something'

理解语法是理解一门语言的关键。
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Constructions with 'IS TO DO SOMETHING'

Be后面跟一个带to的动词不定式的结构用来表达将要发生的动作(在未来):

•  提前已经决定要做的将来动作:
Polly is to attend the conference in Bruno's place. 宝丽将代替布鲁诺参加会议。
The Prime Minister is to arrive today in Tokyo. 总理今天将到达东京。
To whom is this letter to be sent? 这封信应该送给谁?
•  强制进行的动作和指令:
Rooms are to be left before 11 AM. 上午11点前必须离开房间。
You are not to walk on the lawn. 你不能在草坪上走。
注意:
•  在被动语态里(is to be done...), 这个表达的含义与cancould类似:
How is this work to be finished in time? 这项工作怎么样才能准时完成呢?
•  相近表达法: Be due to:
The Prime Minister is to arrive today. = The Prime Minister is due to arrive today.总理今天将会到达。

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