
Not be supposed to do something
Cultural Norms
Sometimes it's about behaving according to cultural expectations, not just formal rules.

In Japan, you're not supposed to wear shoes inside someone's home.
Implicit Rules
It may refer to unwritten social rules that people are expected to follow.

You're not supposed to talk about politics on the first date.
Authority Figures
Often used when referring to rules set by parents, teachers, or bosses.

My dad said I'm not supposed to stay out past midnight.
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