istobedone是什么時態

　　A lot of work is to be done this week.

　　本周將有許多工作要做。

　　The question is what is to be done next.

　　問題是下一步該干什么。

　　I shall advise with my friends as to what is to be done.

　　至于該做些什么事，我會與朋友們協商好。