Grammar高一英语下册Unit14.pptVIP

Grammar 1. Had better 最好最做某事 (1) 肯定句: you’d better do sth. You’d better leave here now. (2) 否定句: you’d better not do sth. You’d better not leave here now. (3) 疑问句: had you better do sth.? Had you better leave here now? (4) 反意疑问句: You’d better not leave here now, had you? You’d better leave here now, hadn’t you? 2. 情态动词ought to 与should 的用法 Ought to 和 should都可以表示”应该”的意思 Ought to 表示“按理应该……”，侧重反映客观的情况。 Should 表说话者的主观看法。 I think you _______ call on Mary next week. You have seen him for three times, so you __________ know him. should ought to (2) 否定句： ought not to 与 should not 意思基本相同 (3) Ought to have done = should have done 应该做某事但实际上未做 我原本应该抓住这个当经理的机会，但是我错过了。 I should have / ought to have seized the opportunity to be a manager, but I missed it. 3. 更多情态动词： Must I come here early? Yes, No, you must. you needn’t / don’t have to. (2) Must have done 对已发生事的肯定推测 shouldn’t have done 对已发生事的否定推测 他去年一定去过美国。 He must have been to America last year. He must have been to America last year. (3) Would have done 表现实中结果没发生的事 没有你的话我就死了。 Without you I would have died. (4) needn’t have done 原本没必要做某事 你原本不必起那么早，但是我们实在需要你帮忙。 You needn’t have got up so early but we really need your help. Model verbs (Ⅱ) must have to have got to must not / mustn’t don’t have to haven’t got to / hasn’t got to Must sb…? Do / Does sb. have to …? Have / Has sb. to …? （必须、应当） （必须、不得不） 表示义务、命令或必要，后面接不还to的动词学定式。 　 Soldiers must obey orders. We must keep our word. 2. must 用在否定句结构中表示“不允许、禁止” He must not leave his room. You mustn’t smoke in the office. 3. must用在一般疑问句中，肯定回答用must，否定回答用needn’t 或don’t have to —— Must I hand it in before five? —— No, you _________________________. —— Yes, you ______________. you needn’t. / don’t have to you must have to 由have + to组成。因此具有have的各种时态。 He is an invalid and has to have a nurse. She knew what she had to do. I shall have to reconsider my position. He is always havi