(sth) be to (do): 1. 不可避免要发生或必须发生。 They said goodbye, little knowing that they were never to meet again. She is to be honoured for this great work.
2 表示按计划、安排要发生的动作
We were to have been married last week The train is to arrive in BeiJing at 10:25
Tell her she is not to be back late!
3 表命令