(sth) be to (do) 还可以表示一下意义:
表示计划安排的事 They are to get married next month. 表示责任义务 I am to call them once I reach the airport. 表示说明、规定等的规定和要求 This medicine is to be taken three times a day. 表示不会或没有大声(用于not/never, etc to be done) Anna was nowhere to be found. 表示与将来事实相反的假设(用于虚拟条件句,只能用were to do) If we were to offer you more money, would you stay.