must

助动词（Modal auxiliary） YanKang 主持

Must Must 这个词的最大特点是责任 obligation 表述：你必须如此这般，比如 you must eat to live；其否定式Mustn't = 你必须不如此这般: you mustn't smoke in here! 与Must近义的有 have to。但have to 的否定式是“don't have to"--你不必如此这般。另一个近义词是need to: 你有必要如此这般。其否定式don't need to 或 needn't 的意思是，你没有必要如此这般，不然就是多此一举。比如: you needn't hurry: we have plenty of time.

			学个词语音学简单对话	常用词汇基础语法试题		用于推论 deduction "There is soneone knocking on the door.""Yes, it must be Tom,. He always gets home at this time" 和 should 比较 Should 责任意义比较弱，有“应当”，没有“不得不”的意思。在推论中，must 斩钉截铁，should 则留有回旋余地。
		Must: this is a logical conclusion. Should: this is a logical conclusion, but I may be wrong. 　　　　　　下页