情态动词 中小学语法（课堂PPT）

1、1Summer is coming.2A big suntell me some words about it.hotsunnyholidayswimIce-creamskirtfire3 What shall we do if a fire happens?Discussion4must or mustntmust or mustnt4. Take the left.乘电梯逃离。5. Jump out of the tall building.跳楼.1.Use wet quilt or cloth to block the door.用湿的被褥或衣服堵住门。2.To make a quick

2、 departure， run away.当机立断，迅速逃离。 3.Call 114.6.putting it out with a fire-extinguisher用灭火器灭火。7.Find some extra way to get themselves out.多掌握几条逃生路线。5情态动词6 情情态态动词有时又叫情态助动词。情态动词本身虽有一定词义本身虽有一定词义，但不能独立用作谓语不能独立用作谓语、也没有人称和数的变化没有人称和数的变化，其后一定要跟随跟随动词原形动词原形，共同构成复合谓语。7May I?May I come in?May I use your pen?He mus

3、t take some medicine.Mustnt swimMustnt touch8常用的情态动词有哪些？常用的情态动词有哪些？ Can能，会-cant 不会 Could-couldnt/be able to May可能，或许-may not Might可能（更加委婉）-might not Must必须-mustnt Have to不得不-dont have to Need需要-neednt9Lets do itLets do itI( )dance. I ( )go to Harford one day.You( )turn off the lightwhen you leave th

4、e room10 1.Tommy can drive the car Robot can do many things. 2.I could send cards before having the computer lessons.(表示过去的一种能力) Could I sit here?(用于一般疑问句中，语气更加温婉) 3.be able to可用于各种时态之中 I will be able to live on the moon. She was able to (could) finish the homework.11 I was able to Disney last month

5、. I was able to swim across the Ganjiang river last summer.（表示有能力做，并且成功了） She could fly over the South Pole.(不一定成功)121.can/could/be able to? 1.can能，会 2.could比比can更为委婉的语气；表示过去曾有过更为委婉的语气；表示过去曾有过的能力；的能力； 3. was (were) able to与与could的区别是表示不但的区别是表示不但有能力，而且成功的做了某事。有能力，而且成功的做了某事。13 He may be sick.(生病的可能性较大

6、生病的可能性较大) He might be sick.(生病的可能性较小生病的可能性较小) (2)may/mightMight比比may更委婉更委婉注意： may引导的疑问句，肯定回答用：Yes, you may. 否定回答用： No, you mustnt. (No, you cant或No, you had better not.)表示“千万不要”，“不可 以”，“禁止”的意思。14 3.must, have tomust “一定，必须一定，必须”； have to不得不不得不”。 如果用于过去时或将来时如果用于过去时或将来时 ，要用，要用have to来代替，但来代替，但must可用于间

7、接引语，表示过去的必要和义务。可用于间接引语，表示过去的必要和义务。You must stop smoking. 你必须把烟戒掉。(强调主观意志)I have to stop the car and wait for the policeman. 我不得不停车等那个警察。(强调客观) Must提问 否定回答只能用neednt或者dont have to15I must study hard.i have to study hard.16骂你没妈骂你没妈17 Must提问-neednt回答（dont have to） May提问-mustnt回答（cant）18 4.needA 作为情态动词使用

8、：作为情态动词使用：need没有时态与人称的变没有时态与人称的变化，并且多在化，并且多在否定句否定句，疑问句疑问句和条件句中使用，和条件句中使用，含义为含义为“需要，必须需要，必须”。You need not hand in the exercise today.你不必今天交作业。 Need we find time to go into the question?要不要我们找时间把这个问题深入研究一下?195、情态动词表示推测或判断的用法、情态动词表示推测或判断的用法情态动情态动词词对现在和未来的推对现在和未来的推测测对过去的推测对过去的推测 使使 用用 场场 合合mustmust + 动词

9、原形动词原形must have done肯定句肯定句may / mightmay / might + 动动词原形词原形May / might have done肯定句、否肯定句、否定句定句can /couldcan / could doCan / could have done否定句、疑否定句、疑问名（问名（could可用于肯定可用于肯定句）句）20It must have rained last night.(对过去的猜测对过去的猜测)21情态动词练习（1）1. We _ for her because she never came. A. neednt wait B. shouldnt h

10、ave waited C. mustnt wait D.mustnt have waited2. Janny _ have kept her word. I wonder why she changed her mind. A. must B. should C. need D. would3. Its nearly seven oclock. Jack_ be here at any moment. A. must B. need C. should D.can 4. When can I come for the photos? I need them tomorrow afternoon. They _ be ready by 12: 00. A. can B. should C. might D. need5Be quick! They _ for us at the church gate right now.A. must wait B. must have waited C. must be waiting D. ought to wait22 6.should， wouldshould表示表示应该应该做某事或承担责任、义务；做某事或承担责任、义务；例如：You