shouldn't, не следует, should, следует, You must wash your hands., должен, You mustn't take photos here., нельзя, запрещено , (I/you/we/they) have to / (he/she/it) has to, обязан, вынужден, (I/you/we/they) don't have to / (he/she/it) doesn't have to, не обязательно делать.

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