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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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更新时间:2024/10/30 14:15:43