文档介绍:情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等. 情态动词无ood friend, so you must know what he likes best.(精品文档请下载)
2. Your mother must be waiting for you now。
四、 dare, need
1) dare作情态动词用时, 常用于疑问句、否认句和条件从句中, 过去式形式为dared。
1. How dare you say I’m unfair?
2. He daren’t speak English before such a crowd, dare he?(精品文档请下载)
3. If we dared not go there that day, we couldn’t get the beautiful flowers.(精品文档请下载)
2) need 作情态动词用时, 常用于疑问句、否认句。在肯定句中一般用must, have to, ought to, should代替。(精品文档请下载)
1.You needn't come so early.
2. --—— Need I finish the work today?
—-—— Yes, you must。 / No, you needn’t。
3) dare和 need作实义动词用时, 有人称、时态和数的变化。在肯定句中,dare后面常接带to的不定式。在疑问句和否认句中,dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。(精品文档请下载)
1. I dare to swim across this river。
2. He doesn’t dare (to) answer.
3。 He needs to finish his homework today.
五、 shall, should
1) shall 用于第一人称,征求对方的意见。
What shall we do this evening?
2) shall 用于第二、三人称,表示说话人给对方的命令、警告、许诺或威胁。
1。 You shall fail if you don’t work hard.(警告)
2。 He shall have the book when I finish it。(许诺)
3。 He shall be punished.(威胁)
六、 will, would
1) 表示恳求、建议等,would更委婉。
Will / Would you pass me the ball, please?
2) 表示意志、愿望和决心。
1. I will never do that again。
2. They asked him if he would go abroad。
3) would表示过去反复发生的动作或某种倾向。would表示过