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Constructions with 'is to do something'

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Constructions with 'IS TO DO SOMETHING'

Be followed by a verb in the infinitive with to is used to express an action which will happen (in the future):

•  Future actions which have been decided in advance:
Polly is to attend the conference in Bruno's place. Polly will attend the conference in Bruno's place.
The Prime Minister is to arrive today in Tokyo. The Prime Minister is scheduled to arrive in Tokyo today.
To whom is this letter to be sent? To whom should this letter be sent?
•  Imposed actions and instructions:
Rooms are to be left before 11 AM. You must leave your room before 11 AM.
You are not to walk on the lawn. You must not walk on the lawn.
Note:
•  In the passive voice (is to be done...), this expression can have a similar meaning to can or could:
How is this work to be finished in time? How can we complete this work before the deadline?
•  Related expression: Be due to:
The Prime Minister is to arrive today. = The Prime Minister is due to arrive today.

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