前者是应该去做某事 后者是(别人)猜测某人会去干某事
be supposed to应该做某事,相当于ought to do 和should,口语中更多使用be supposed to和should
例句：
A:Stop messing my life!
B:I’m sorry.I just did what I am supposed to do.
二者也都可表一种可能性 都不是很确定的的语气 但是be supposed to常用
be supposed to do和ought to有什么区别
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