您现在的位置:主页 > 词性 > 动词 > 情态动词 > 文章内容

带to 的情态动词

作者: admin来源: 网络文章 时间: 2013-03-02

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。


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。

 

相关推荐

(would可以看作是will的过去式,这两个词除了时态不相同外,在表达意思的许多方面是相近的。当然will 和would又都有一些各自不同的独特用法。) 1)用于第二人称疑问句,表示请求(在这种用法中would...[阅读全文]

1) would rather的用法 would rather do would rather not do would rather than 宁愿而不愿。 还有would sooner, had rather, had sooner都表示宁愿、宁可的意思。 例句: If I have a choice,...[阅读全文]