be supposed to do的意思|示意
应该干……
be supposed to do的用法详解
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用法讲解：
英语中的助动词be supposed to do的用法主要表示某种规定、命令、安排或义务，句中的主语一般是人，而动词supposed一般没有被动语态，它也可以用来表示某事应该发生，但尚未发生。
一、表示有义务或应该做某事
be supposed to do表示应该做某事，但仍没有做，多指形式性地有义务或应该做某事，它可以用来替代should/ought to do，表示建议、推荐或安排必须做某事。
例句：
1. You are supposed to finish your work on time.
2. We are supposed to meet at the gate at 8 in the morning.
3. My father said that I am supposed to wear a suit to the party.
二、表示意料之中的结果
be supposed to do的用法表示某事可以预料，通常情况下会发生，句中的主语一般是事情，表示主语将会发生某种情况。
例句：
1. It's supposed to rain tomorrow.
2. You are supposed to get good grades if you study hard.
3. They are supposed to arrive at around 6 o'clock.
'be supposed to do相关短语
1、 Sb be supposed to do 被期望做
2、 be supposed to do sth 应该做,应该做某事
3、 Be supposed to do something 本应该做某事,应该,应该做某事
4、 D be supposed to do 被期望
5、 be e supposed to do 被要求干什么
6、 be not supposed to do 不应当