情态动词表推测课件（经典实用）.ppt
ModalVerbs,情态动词表推测课件,must, can, could, will, would, may, might, should, ought to,mustmaymight（could） can, could 一般用于否定句和疑问句中cant一定不，是must的否定句,情态动词 can, could, may,might,must表推测的用法：,情态动词中的can, could, may, might, must都表推测。其中must的可能性最大，can / could次之，may / might最小。具体用法如下：1. must的用法（1）表示推测“可能性”时，意思是“一定、准是”，语气较肯定，较有把握。He must be American. = It is certain that he is American. 他准是个美国人。,（2）must表推测只能用于肯定句。 如表示“一定不、肯定不”的意思时，改为否定用cant, 如询问某种可能时，应用can。He must know my address. 他肯定知道我的地址。 （一定） He cant know my address. 他肯定不知道我的地址。 （一定不）Can he know my address? 他知道我的地址吗？ （询问可能性）,（3）must表示推测时，可以推测现在/正在发生的动作 He must have a car now. （现在）他一定有辆小汽车。He must be doing his exercises in the classroom.（正在进行）他一定在教室里做练习。,（4）在反意疑问句中，当附属部分含有表示推测意义的must时，疑问部分的助动词应与must后面的动词在非推测情况下的用法保持一致。 He must be a worker, isnt he? （现在）他准时个工人，是吗？,2. can / could的用法（1）can表示推测“可能性”时，往往用于否定句或疑问句。Cant“一定不”，can在疑问句中意思是“会、可能”。He cant be at home. = It is impossible that he is at home. 他一定不在家。,（3）could 还可以用于表示客气、委婉、礼貌的请求语气。 Excuse me, could you tell me the way to the bus station?Could you help me?,3. may和might的用法（1） may, might表示推测“可能性”时，意思是“可能”、“也许”He may / might be American. = It is possible that he is American.他可能是个美国人。注：might不表示过去时态，只是语气上比may更委婉，表示的可能性更小。（2）may, might表推测时，可以用于否定句，意思是“可能不、也许不”，但不用于疑问句。He may / might not be at home. 他也许不在家。,情态动词表推测课件,情态动词表推测的三种句式,1.在肯定句中一般用must (一定)，may（可能），might / could（也许，或许）。 It be Nings. It has her name on it 。 The guitar belong to Alice. She plays the guitar.,情态动词表推测课件,2.否定句中用cant / couldnt(不可能), may not/might not(可能不)。 （1）It _ be the headmaster. He has gone to America （2）He know the scientist. 他也许不认识那位科学家。,情态动词表推测课件,3.疑问句中用can/could (能?)。 （1） he finish the task? 他可能把任务完成吗？ （2） he be at home now? 他现在能在家吗？,Choose the best answers :1. I thought you_ like something to read. So I have brought you some books. A. ought B. might C. would D. must,2. That man must be Sarahs husband.-No, he_ be her husband. She is still single.A. cant B. mustnt C. may not D. ought to 3. Peter _come with us tonight, but he isnt very sure.A. must B. may C. can D. will,4. What_ it be?-It_ be a mail box, for it is moving. It_ be a car.A. can; cant; must B. can; can; mustC. can; mustnt; must D. must; mustnt; can 5. Look, someone is coming. Guess_ .-Jack. Hes always on time.A. who can it be B. who he mayC. who he can be D. who it can be,6. David, you _play with the valuable bottle, you_ break it.A. wont; cant B. mustnt; mayC. shouldnt; must D. cant; shouldnt,7. Sue_ come together with us tonight, but she isnt very sure yet.A. must B. may C. need D. will,此课件下载可自行编辑修改，供参考！ 感谢你的支持，我们会努力做得更好！,
