| 词组 | must |
| 释义 | 1． 用在第三人称单数中，形式不变: He must be tired. 2． 没有过去式，在表示 “必须”的过去式时，常用 had to 代替: He had to go to bed early last night. 3． 在过去时态的间接引语中常用 must: Last weekend she told her mother that she must go abroad for fur- ther studies. 4． must not 在口语中常缩略成 mustn't: You mustn't leave right away. 5． 表示“应该如何做”，must 可以用在将来时态中，形式不变: You must arrive there by midnight the day after tomorrow. 6． 将来时态中表示 “必须做 ……”， 可以用 will have to 取代 must: She will have to get up earlier to- morrow morning. 7． 表示 “不必做 ……”，常用 not have to，not need to，needn't 来取代 must: You needn't be here. You don't need to help him. 8． must have 加过去分词常表达说话者对过去发生的事情的推断，表示“相信过去发生了某事”: He must have read the morning paper. 9． 作名词，表示 “必不可少的事物”， 在现代口语中很常见: Neatness and consideration is a must. Spanish is a must. Getting enough sleep is a must. |
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