You should really wear a suit. - You're really supposed to wear a suit., You shouldn't smoke here. - You're not supposed to smoke here., You have to arrive on time. - You must arrive on time., You don't have to wear a uniform. - It isn't necessary to wear a uniform., You have to speak English. - It's necessary to speak English., You have to drive on the left. - You must drive on the left., You're allowed to smoke here. - It's all right to smoke here.,

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