带to 的情态动词有四个:ought to, have to, used to, be to, 如加上have got to ,, 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 didnt 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。
典型例题
Tom ought not to ___ me your secret, but he meant no harm.
A.have told B.tell C.be telling D. having told
答案A。由于后句为过去时,告诉秘密的动作又发生在其前因,此地应用过去完成时,但它在情态动词 ought to 后,所以用have。
跟我背CET4核心词汇:precaution
跟我背CET4核心词汇:identify
跟我背CET4核心词汇:distinguish
跟我背CET4核心词汇:exploit
跟我背CET4核心词汇:range
跟我背CET4核心词汇:virtue
跟我背CET4核心词汇:orient
跟我背CET4核心词汇:advertise
跟我背CET4核心词汇:remote
跟我背CET4核心词汇:bargain
跟我背CET4核心词汇:consistent
跟我背CET4核心词汇:forbid
跟我背CET4核心词汇:debt
跟我背CET4核心词汇:explosive
跟我背CET4核心词汇:global
跟我背CET4核心词汇:grand
跟我背CET4核心词汇:scan
跟我背CET4核心词汇:comment
跟我背CET4核心词汇:racial
跟我背CET4核心词汇:offend
跟我背CET4核心词汇:radiation
跟我背CET4核心词汇:virtual
跟我背CET4核心词汇:explore
跟我背CET4核心词汇:poverty
跟我背CET4核心词汇:religious
跟我背CET4核心词汇:render
跟我背CET4核心词汇:issue
跟我背CET4核心词汇:capture
跟我背CET4核心词汇:valid
跟我背CET4核心词汇:radical
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