教师招聘英语知识点：be to do、be going to do辨析（语法知识）六

表示 “义务”、“应该” 。(意思接近于should，must，ought to，have to) 如：

No one is to leave the building. 谁也不得离开这楼房。

You are not to smoke in this room.=You are not supposed to smoke in this room.

You are to be back by 10 o’clock. 你必须十点以前回来。更多真题及资料请加小编微信65210638领取