看美剧学英语实用表达：Be supposed to
Be supposed to: to have to; to have a duty or a responsibility to; to be intended to; used to show that you do not believe that something or someone really is what many other people consider them to be.中文释义：用来表示根据规定或传统习惯人们不得不做的事。当be supposed to…的主语是“人”时，意思是“应该……”“被期望……”，它可以用来表示劝告、建议、义务、责任等，相当于should do但be supposed to强调客观上，should强调主观；当be supposed to…的主语是“物”时，意思是“本应该……”；“本该做……”，用于表示“某事本应该发生而没有发生”；be supposed to 还表示“被认为……；被相信……”例句：You are supposed to finish your homework on time.（你应该按时完成你的作业。）
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