正在下载：2020学年九年级英语单元知识点 Unit10 You re supposed to shake hands

1.be supposed to do... 词意 应该做…… =should / ought to 表示劝告、建议、义务、责任 后+V.原 否定形式：be not supposed to eg: You're not supposed to be here. Do you realize I'm supposed to kill you?...