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be to
01
しなければならない, 予定されている
used for expressing possibility or for indicating something that is due to happen or take place
Example
The president is to arrive in the country tomorrow.
If we are to win this game, we must play our best.
The meeting is to start at 10 a.m.
1.1
する必要がある, すべき
used to express necessity or obligation
Example
You are to complete this project by Friday.
All employees are to wear identification badges while on company premises.
If you are to succeed, you must work hard.
