情态动词讲解课件.pptxVIP

一、动词分类：四种 二、情态动词特点 1. 情态动词不受主语(单复数\人称)影响。 2. 情态动词+动词原形做谓语。 特例： ought to+动词原形 have to +动词原形 3. 否定式：情态动词+not+动词原形 疑问式：情态动词+主语+动词原形…? 4. 情态动词的基本要求： 1)有哪些？ 2) 基本意义和特殊用法。 1 三、情态动词巧妙记忆 (一)原形和一般过去式 1.can\could 2. may\might 3. shall\should 4. will\would 5. have (has) to\had to (二)无形式变换的 1.must 2. ought to 2 (三)既可以做情态动词又可以做实义动 词的 dare ，need 做题时需要分类讨论 (四) had better used to would rather 3 四、高考情态动词考点一 1. shall 1) 一，三人称，疑问句， 征求对方意见或 请求。 2) 二，三人称，陈述句, 命令,警告,允诺,威 胁。 3)条约、法律、规章、预言等文件中，表 示义务、规定。一二三人称。 4 2. must 1)第二人称，翻译成： “偏要，硬要” 2) 表示推测时， 只能用于肯定句。 must be 现在的动作 “肯定是……” must be doing 现在正在进行的动作 “现在肯定正在做……” must have done 过去发生的事情 “过去肯定做了某事” 5 3. can /could 1)表示推测时，主要用在否定句或疑问句中。 can’t be\couldn’t be “肯定不是……” It’s so late. Can Tom be reading? It can’t be Mary. She has fallen ill. can/could not be doing “肯定不是正在做……” can/could not have done “过去不可能做某事” I saw him just now so he couldn’t have gone abroad. 6 2) can/could have done 用于肯定句中 “本来能做” You could have had a better mark. 3) ---Could (Can) you…? --- Yes, I can (不用could) --- May I use your computer? --- Of course you can. 7 4) cannot (help\choose) but +动词原形 “不得不，只能” I cannot help but tell her the truth. cannot help it “控制不住，没有办法 ” cannot … too…… “无论怎样也不为过” I cannot thank you too much cannot help doing sth 禁不住做某事 5) couldn‘t +动词原形+ 比较级 (再 ……不过了) It couldnt be better. I couldnt agree with you more. 8 4. may/might 1) 表示推测时，用于陈述句，表示把握不大。 might/may (not) do sth “现在\将来可能(没) 做某事” might\may (not ) be doing sth “现在可能(没)正在做……” might/may have done “过去可能做了某事” 。 might/may not have done “过去可能没做某事”。 9 They may come here tomorrow. He might be doing his homework now. He might have read about the news in the newspaper. 2) May+主语+动词原形。表示祝愿。 祝你成功？ 3) may\might as well do sth =had better do sth “最好” You may as well stay at home tonight. 10 5. mustn’t do 表示“不可以，绝对不能做” don’t have to do 表示 “没有必要做 ”=