摘要:must的用法(1) 表示“必须 “应该 否定式“must not/mustn’t 表示“不应该 “不准 等.在回答带有must的问句时.否定式常用needn’t或don’t have to .而不用mustn’t.The work must be finished as soon as possible.You mustn’t speak like that.Must I be home before eight o’clock?Yes,you must.No,you needn’t./No,you don’t have to.(2) must和 have tomust和have to都可以表示必须.但must表示说话人的主观看法.have to表示客观需要.must只有现在时.要表示过去时和将来时需要用had to和will have to .I must go now.I have to go now.The room is dirty.I have to clean it now.You don’t have to worry about that.The students will have to know how to use the computer.

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