He said,You must start at once.
他说:你必须马上出发。相当于:
He said that she must/had to/would have to start at once.
他说她必须马上出发。
注意:间接引语中用 would have to时,不表示说话人的权威,而只表示客观的必要。
Tom said,If you want to stay on here you must work harder.
汤姆说:你如果想继续留在这儿,就必须更努力地工作。相当于:
Tom said that if she wanted to stay on she must/would have to work harder.
汤姆说她如果想继续留在那儿,就必须更努力地工作。
must意味着汤姆本人坚持要她更努力地工作,而 would have to仅仅意味这么做是必要的。
4 含有must I/you/he?的问句也可进行同样的变化,但因为在疑问句中must常常表示目前或不久将来发生的事、所以常变为 had to:
Must you go so soon? I said.
我说:你必须走得这么急吗?相当于:
I asked him if he had to go so soon.
我问他是否必须走得那么急。
5 must not
I must not常常保持不变。 you/he must not或保持不变,或用否定意义的命令句表示:
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