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It's necessary to turn off your phone
must/have to
It's your obligation to pay bills at the end of month
have to/must
It would be better if you talk to a doctor
should
It would be easier for you to do your homework, if you ask your friend about the task you don't understand
should
It's better not to bother your brother. He's studying
shouldn't
Is it necessary for her to pay the fine?
Does she have to/must
It's better for you to stay at home
should
It isn't necessary to lend him money if you don't want to
don't have to
It is his obligation to give the book back to the library
must
This dress doesn't suit you. It is better not to wear it
shouldn't
