Model-Verbs情态动词.ppt

* Model Verb 情态动词 情态动词 一、特征 1)?????情态动词本身有词义,表示说话人的语气或情态,但词义不完全,不能单独作谓语动 词,只能和不带to的动词不定式(即动词原型)(ought等除外)一起构成谓语动词. 2)?????情态动词所表示的情态有: 命令、允许、请求、拒绝、愿望、愿意、义务、必要、可能、敢于、需要等. 二、形式变化 1) 情态动词没有人称和数的变化, 第三人称单数 的现在时也无变化. 2) 有些情态动词有过去式, 有的过去式和它的原型相同. a. 有过去式的有: can — could may — might will — would shall — should dare — dared need — needed have to — had to b. 过去式不变的有: must — must (或had to) ought to — ought to 三、否定式 shall not — shan’t will not — won’t can not — can’t must not — mustn’t should not — shouldn’t ought not to would not — wouldn’t could not — couldn’t dare not — daren’t need not — needn’t 四、情态动词的种类 要运用好情态动词，就要首先对情态动词有一个完整的认识，情态动词分为三种情况： 1.??只用作情态动词的有： must, can / could, may / might, ought to, be able to 2.?既可作情态动词又可作实义动词的有： need, dare，have /had to, used to 3.?既可作情态动词又为助动词的有： shall / should / will / would 歼灭难点训练 1. (★★★★) Don’t lock the door in case he_______back late at night. A. should come B. might come C. will come D. would come 2. (★★★★★) You________ worry about the old man. He________ well already. A. don’t need; gets B. needn’t; may have got C. mustn’t; got D. don’t need to; may get 3. (★★★★) I’ve tried many times, but the car just ________. A. won’t start B. wouldn’t start C. doesn’t start D. didn’t start 4. (★★★★★) Better set off at once, ________? A. won’t you B. shall we C. hadn’t you D. wouldn’t you B B B B 非推测性情态动词shall, will, must, mustn’t, should, would的用法 情态动词could, should/ought to, may/might , needn’t+ have done 表示假设的用法 情态动词must, can/could, may/might, should/ought to表猜测的用法 情态动词的一些惯用法 表示推测——情态动词的重要用法. 肯定的推测 可能的推测 否定的推测 疑问的推测 must 对将来 对现在 对过去 情态动词 may, might c