新概念英语第二册 第65课词组
(2013-02-24 21:28:43) 转载▼
分类： 新概念英语第2册辅导
本课重点：情态动词Must，Have to，Should and ought to
一、词组 decide to 决定 take?to 带到?去 比较：bring?from 从?带来 be dressed up 打扮起来 dressed up as 扮成
Father Christmas ＝ Santa Claus 圣诞老人 guard of honour ＝ honor guard 仪仗队 set off 出发
this sort of thing 这类事 agree to 同意
get?off 叫??走，离开 be amused 感到有趣 let?off 把??从宽发范 main street 大街 a side street 小路 hold up 阻碍，防碍(交通) refuse to 拒绝，不愿
have a difficult time 伤透脑筋 have a good record —贯表现很好 this time 这次
should have (ought to have) ? 早就该 do you have to? 有必要 you don’t have to 不必
过去式had to代替 must (在过去式中用)
As they didn’t understand，I ________ explain everything again. agree to这个to有时是介词，有时是不定式
He agreed to get someone to help us． (to是不定式) I don’t agree to this． (to是介词) 二、【Key structures 】关键句型 must ，have to , should , ought to
must：必须做某事，通常表示说话人的主观意愿
have to：必须做某事，不得不的含义，通常指句子主语从客观上讲不得不做的含义 should：应该做，强调义务与责任
ought to：应该做，强调义务与责任，但是ought to 比 should 语气更强烈些 1. should have done, ought to have done 应该做（发生），实际上没做（发生） eg. I must leave now. 主观上,我必须走了
I have to leave now. 客观上，我不得不走了
I missed the train, so I had to take a taxi. 我没乘上火车，所以我不得不乘出租车（客观上） 。 前面过去式，所以后面也是过去式
当表过去某时不得不做了某事，只能用had to,不能用must 因为must表必须，表达是对将来行为一种要求和命令，无法表达过去的行为。
eg. She had to go shopping yesterday. 她昨天不得不去买东西
eg. I should do some work tonight, but I think I shall go to the cinema instead. 我今晚本该做功课，但我认为我应该去看电影 should表应做某事，强调义务和责任。
eg. I’m sorry I’m late, I should have taken a taxi. / I’m sorry I’m late, I ought to have taken a taxi. 对不起我迟到
了，我本该打车来的。 should have done/ ought to have done 表示本应该做某事
2. should/ ought to 也可表示“可能”
eg. John should be at home. / John ought to be at home. John可能在家 John should be working, / John ought to be working. John 可能在工作
John should have left now. / John ought to have left now. John 现在可能已经走了
3.情态动词表示说话人对某种可能性感到的肯定或不肯定的程度，可以按照从最不肯定might到最肯定must列出来。 最为肯定的是：must
eg. You might be right. 你或许对了。（表示非常不肯定 没有把握） eg. You may be right. 你可能对了。
eg. You must be right. 你一定对了。（ 一种对判断的肯定