必修三英语unit1情态动词的用法课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,必修三英语unit1情态动词的用法,本课件仅供大家学习学习 学习完毕请自觉删除 谢谢 本课件仅供大家学习学习 学习完毕请自觉删除 谢谢,情态动词,情态动词表示说话人的,语气,和,情态,的动词。,语气,：能力、义务、建议、允诺、许可、推测。,情态,：情感和态度。,观察下列各句，注意谓语动词形式。,1.He,can finish,the paper in an hour.,2.,Would,you please,pass,me the dictionary?,3.She,may be,very busy now.,4.I,will,never,forget,the days we spent together.,5.We,should help,each other.,情态动词的语法特征,1.,不能单独做谓语，即是情态动词,+,动词原形。,例如：,I,can swim,.,（谓语）,(,除,ought to,“应该”和,have to,“不得不”外,),2.,情态动词没有人称，数的变化。,3.,有些情态动词有一般式和过去式，过去式比一般式更委婉。,如,can-could,will-would,may-might,shall-should,建议,请求,允许,能力,Jim isnt good at maths,but he,can,speak English well.,May,I have a look,at your Iphone,?,Would,you like to join my family for dinner?,When going by plane,you,should,arrive on time.,When you eat fish,you,must,be very careful with the bones.,能力,请求/允许,请求,建议,建议,情态动词语法目录,一、can/could,二、may/might,三、will/would,四、shall/should,五、must,I,can/am able to,swim.,I,could/was able to,climb a tree when I was a child.,I,will be able to,swim next week.,The fire spread through the hotel very quickly but everyone,was able to,get out,1.can 表示现在的能力,2.could表示过去的能力,3.be able to 表能力，可用于多种时态,4.be able to 强,调某人通过努力克服困难成,功地做了某事,一、情态动词表能力,2.表“许可”，译为“可以”，could比can语气较委婉。用,can 或cannot/cant,回答,-Can/Could I borrow your bike for a moment?-Yes,you,can./,No,you,cant.,3.,表“可能性”，译为“可能”；,Can,this news be true?,Where,can,they be?,否定句中，翻译为“不可能”,She,cant,have left school,for her bike is still here.,情态动词,含义,否定式,注意点,can/could,表能力,“能，会”,cant,“,不会，不能”,区别,be able to,表许可,“可以”,cant,“,不可以，不许”,代替,may,表推测,“可能”,cant,“,不可能”,主要用于,否定、疑问句,中,1,表示某人通过努力克服困难做成某事,要用,was/were able to.,2,could,might,would,表委婉语气用于疑问句,答语仍须用,can,may,will.,3,can,用于肯定句中,可表示”,有时可能,”,情态动词,含义,否定式,注意点,can/could,表能力,“能，会”,cant/couldnt,“,不会，不能”,区别,be able to,表许可,“可以”,cant/couldnt,“,不可以，不许”,表推测,“可能”,cant/couldnt,“,不可能”,主要用于,否定、疑问句,中,补充：金版,12,页右边第,4,点,May,I eat KFC if I,finish my homework?,may/might:,1.表示许可。表示请求、允许时，might,比,may,的语气更委婉一些。,Might/May,I use your computer?,Yes,you can.,/No,you cant/you may not,/,you mustnt.,may/might:,2.用于祈使句中表示祝愿。,3.表示推测、可能（只用于肯定句，疑问句则要用can或could）。,祝你成功！,May,you succeed.,He,may,be very busy now.,May,you be happy all your life.,情态动词,含义,否定式,may/,might,表许可,“可以”,mustnt,不许，严禁,may not,最好不要,表推测,“可能”,may not,可能不,will 和 would,Will you give him a message when you see him.,用于第二人称，表“询问意愿，提出请求”would you,(用于现在时),语气更为婉转,2.We will help him if he asks us to.,表“意志，意愿”，译为“会”过去时：woul,d,I promised that I,would,do my best.,3.He,will,always take a walk after supper.,习惯上会发生的事情,During the vacation he,would,often visit me.(过去式),4.某种特定情况下真实或可能的事情,At that time,people,would,starve if food was difficult to find.,情态动词,用 法,will,1.表请求,(,第二人称,),2.表意志,意愿,3.表某种倾向或习惯,4.某种特定情况下真实或可能的事情,would,更客气的,请求,过去的意志,意愿,过去的倾向或习惯,过去某特定情况会发生的事情,shall,:,1.Shall,用于第一、第三人称疑问句中，表示说话人征求对方的意见、向对方请示或提供帮助,。,1.,Shall,we begin our lesson?,2.When,shall,he be allowed to leave hospital?,3.,Shall,I carry this bag for you?,shall:,2.Shall,用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。,You,shall,fail if you dont work harder.,He,shall,be punished according to the rule.,He shall have the book when I finish it.,警告,威胁,允诺,should,1.,Young people should respect old people.,should,表“义务，建议”,。,2.,Its five oclock.John,should,be at home now.,表推测，按道理应当。译为“理应，估计,We have prepared a fridge of good and drinks.That,should,be enough for the party.,3.表示“竟然”,Its a pity that he,should,be so rude to a lady.,情态动词,用 法,shall,征求对方意见,(,第一,三人称,),表示命令,警告,威胁或允诺,should/,ought to,表示劝告,建议,命令或责任,“应该,必须”,表示推测,“,理应,估计,大概”,should,还可表示,“竟然”,must,表“必须”,dont have to,dont need to,neednt,Must we hand in our exercisebooks today?,Yes,you must,/No,you,dont have to,2.,1.不必须,mustnt,禁止,表“推测”时：,肯:must be+表语(一定）,否:,cant (不可能),e.g.That cant be Mary.She is in New York.,3.have to“不得不”，表客观需要,情态动词,含义,否定式,注意点,must,表必要,“必须”,neednt,“,不必”,(,区别,have to),有时表“,偏要,”,表推测,“一定”,cant,“,不可能,”,只能,用于,肯定,句，,不能,用于,否定、疑问句,You _ buy a gift,but you can if you want to.,must B.mustnt,C.have to D.dont have to,2.When I was young,I was told that I _ play with fire.,A.wouldnt B.neednt C.mustnt D.darent,3.-May I smoke here?,-If you _,choose a seat in the smoking area.,A.should B.could C.may D.must,情态动词表推测,可能性的强弱层次,must,should/ought to,can/could,may/might,1.That,_,be Anns husband,for I am sure that he doesnt wear glasses.,A.cant B.may not,C.mustnt D.neednt,2.-Good morning.I got an appointment with Miss Smith yesterday.,-Ah,you _ be Mr.Peter.,A.might B.must C.would D.can,3.What do you mean,there are only ten tickets?There _ be twelve.,A.should B.would C.will D.shall,4.It is usually warm in my hometown in March,but it _ be rather cold sometimes.,A.must B.can C.should D.would,5.Although this _ sound like a simple task,great care is needed.,A.must B.may C.shall D.should,阅读下列学生书面表达常见错误句子并改正：,1.Thanks to your help,I can back to school again.,2.You will happy when you get a gift.,3.You can be taken Bus No.3 to the theatre.,4.We should to help eac