Won’t you sit down?你不坐吗?
11.情态动词的回答方式
问句 肯定回答
否定回答
Need you...?
Yes,I must.
No,I needn’t
Must you...?/
don’t have to.
12.带to 的情态动词
带to 的情态动词有四个:ought to,have to,used to,be to,如加上have got to(=must),be able to,为六个。它们的疑问,否定形式应予以注意:
Do they have to pay their bill before the end of the month?
She didn’t use to play tennis before she was fourteen.
You ought not to have told her all about it.
Ought he to see a heart specialist at once.
ought to 本身作为情态动词使用。其他的词作为实义动词使用,变疑问、否定时,须有do 等助动词协助。
13.比较need和dare
这两词既可作实义动词用,又可作情态动词用。作为情态动词,两者都只能用于疑问句,否定句和条件句。 need 作实义动词时后面的不定式必须带to,而dare作实义动词用时,后面的to 时常可以被省略。
1)实义动词:need(需要,要求) need+n./to do sth.
2)情态动词:need,只用原形need后加do,否定形式为need not。
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