Correct: Should is for giving an advice., Must expresses obligation, Prohibitions are expressed by using musn´t, have to and must could be used when referring to obligations, If is not neccesary, you don´t have to do it., A Terranova online student must turn off the micro., Incorrect: Use have to for advices, You mustn´t do the homework, A Terranova student doesn´t have to be honest. , A Terranova on line student should turn on its camera, Have to and must express prohibitions,

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