新概念英语第二册77-04

发布时间：2012-12-26 编辑：查字典英语网小编

agree to do : 同意做某事(to 为不定式 )

agree with sb

agree to (prep)sth

I agree with you. / I agree to your advice. / I agree to go with you.

off＝away from离开什么地方

must+v推测 ; have to: 不得不

afterwards＝later后来

it was fortunate that...

carry : 抬起来

should跟现在有关系

should have done跟过去有关系

let sb off(go) : 让某人走(离开)

record : (警察局的)记录

set up a new world record

sb have a good record

resume : 履历

(resume n.摘要, 概略, <美> 履历 vt.再继续, 重新开始, 重新占用, 再用, 恢复)

情态动词+have done一定和过去有关系

1、表示推测的过去 : must/can't/may

2、虚拟语气相连 : would have done

3、should have done : 原本该做但是没做

4、needn't have done : 原本不必做但是做了

【Key structures】关键句型

should(应该)/ought to(应该)/have to

ought to : 应该(强调义务)

have to : 不得不

must表示推测

should应该(含有建议)

Exercise C Supply the correct form of should, ought to, or have to in these sentences:

用should, ought to, 或have to填空 :

1 He______(come) at 4 o'clock if the plane arrives on time.

2 I didn't go shopping this morning as I_______(do)the housework.

3 She_______(come) to see me yesterday, but she forgot.

4 You_______(ask) for permission before you left the table.

5 As they didn't understand, I_______(explain) everything again.

1 should come 2 had to do : 不得不 3 should have come 4 ought to have asked

5 had to explain

【Special difficulties】难点

let sb off : 让某人走 / let sb down : 让某人失望 / let sb in/out : 让某人进来/出去

情态动词如果后面加动词原形,认为跟现在或将来有关,一旦要和过去有关,一定在情态动词后面加have done

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