统招专升本英语情态动词考点归纳

　　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。

　　1. can, could表示能力、允许、客观可能性。

　　注意：表能力时could是can的过去式;允许时could比can更委婉，表客观可能性时could可能性比can小。eg:She is only four, but she can read.

　　This sort of thing can't go on.

　　I couldn't follow her speech.

　　Could you lend me your bike?

　　Fire can't destroy gold.真金不怕火练

　　2. may, might表示允许、猜测。

　　【注意】表允许时might比may更委婉;表客观可能性时might可能性比may小。eg:The dialect of one province may be quite different from that of the next one.

　　Students may not stay out after midnight without written permission. (stay out在外边待的很晚)

　　He asked his mother if he might go out to play.

　　"May | open the window?" "Yes, please./ Please don't./ No, you mustn't." (mustn't“不许、不准”)

　　3. must

　　1)表示可能性"肯定"、“准是” ，其否定形式是can't

　　2)表示'必须"。must只用在一般现在时和一 般将来时，此时must=have/has to,而have to可以用在任何时态。否定形式

　　needn't

　　3)mustn't表示"千万不要"、"一定不要”。eg:He must be a student.

　　Teachers always tell us we must do everything step by step.

　　--Must I go tomorrow?

　　--No, you needn't (yes, l'm afraid so. must一般疑问句的否定needn't来回答)

　　You mustn't talk like that to your parents

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