You don’t have to wear a uniform. - It’s not necessary; it’s optional., You must study for the exam. - It’s necessary; you are obligated to do it, You mustn’t touch that wire! - It’s dangerous or not allowed., She doesn’t have to cook tonight. - It’s not required because someone else will do it, We have to arrive on time. - It’s your duty or rule to follow., You mustn’t smoke here. - It’s forbidden; you can’t do it., He doesn’t have to go to work today. - He’s free today; it’s not necessary for him to go,

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