be to
01
将要, 预计
used for expressing possibility or for indicating something that is due to happen or take place
例子
The president is to arrive in the country tomorrow.
总统将于明天抵达该国。
If we are to win this game, we must play our best.
如果我们要赢得这场比赛，我们必须发挥出最好的水平。
1.1
必须, 应该
used to express necessity or obligation
例子
You are to complete this project by Friday.
你必须在星期五之前完成这个项目。
All employees are to wear identification badges while on company premises.
所有员工在公司场所内必须佩戴身份徽章。
