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 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.? 例:Tom ought not to me your secret, but he meant no harm. A.have told B.tell C.be telling D. having told 第4讲:定语从句 用来说明主句中某一名词或代词(有时也可说明整个主句或主句中一部分)而起定语作用的句子叫作定语从句. 【
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