must

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【释义】：

aux．v．❶ (表示责任、义务或必要，否定式用need not)必须．We must get everything ready before the outbreak of war．我们必须在战争爆发之前做好一切准备．You must give him a hand but vou need not do so now．你必须帮助他，但是现在不必这样做．Must I return you the book today?一Yes，vou must(No，you needn’t)．我必须今天把书还给你吗?——是的，要今天还(不，不必今天还)．(注意：must not表示禁止，不可以：You must not do it．你不可以做那件事．)❷ (表示希望、劝告)应该，应当：I must ask you not to do that again．我应该要求你不要再做那事．❸ (表示肯定)总要，一定要：Bad seed must produce bad corn．坏种结坏果．❹ (表示推测，具有近于肯定的可能性，否定式用can not or could not)一定，准是：She is out．She must go and pay a home-visit．她出去了．她一定去家访了．You must be very tired atter your long walk．你走了这么远的路一定很累了．He must have suffered terribly in the past．他过去一定很苦．She must come tomorrow．她明天准来．❺ 不巧，偏偏：Just as we were about to start，it must rain．正当我们要出发时，偏偏下雨了．

－n．(a must)【口语】绝对必要，必须要做的事：This decision is a must．这项决定必须执行．

－a．【口语】(绝对)必要的：a must book必读的书．