I have to finish this report by 5 p.m., It's necessary., We needn't do it by the end of the day today., It's not necessary., You shouldn't go out without a coat., It's not a good idea., We don't need to go out later., It's not necessary.., You mustn't put your foot on the seat., It's not allowed., You don't have to sit here., It's not necessary...

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