2016年江西成考专升本英语考试复习笔记17(3)

来源：: 江西成考网
发布日期: 2017年04月19日

摘要：　　情态动词有can， could， may， might， must， should， ought to， need， dare， had better， would rather 等。情态动词相当于助动词，不能单独使用，必须再接动词原型。ought to 整个相当于情态动词，否定是在情态动词后加not，但是ought to的否定是ought not to. 　　1、can， could 　　表示能力、允许、客观可能性。　　She is only four， but she can read.

d he needn’t hurry.

　　need 还可以作实义动词，后面接动名词时相当于被动结构。

　　You don’t need to stay.（=You needn’t say. ）

　　Does he need to know it？（= Need he know it？）

　　needs/ wants/ requires +doing相当于被动语态。

　　The question needs/ wants/ requires discussing.（=needs to be discussed.）

　　My shoes need repairing.（My shoes need to be repaired.）

　　物作主语时need接doing表被动。

　　6、dare

　　表示“敢”，也可以作实义动词，主要用于否定句、疑问句。

　　The boss is so hot-tempered that no one dare tell him the bad news.（so……that 如此……以至于）

　　Who dare stop you？

　　He doesn’t dare to look out of the window.

　　情态动词没有人称性数的变化，有人称性数变化的一定是实义动词。

　　She dare not say what she thinks.（=She doesn’t dare to say what she thinks.）

　　7、had better

　　表示“最好”。否定为 had better not

　　I had better not disturb him.

　　We had better go and see the doctor now.

　　8、would rather

　　表示“宁愿”，后面接从句时，从句的谓语用一般过去时。否定用would rather not.

　　I’d rather not say anything.

　　John would rather work in a company th