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上一页,首 页,下一页,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,*,ModalVerbs,*,ModalVerbs*,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,*,must,can,could,will,would,2,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。,*,情态动词 can,could,may,might,mus,（,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）,*,（2）must表推测只能用于肯定句。*,（,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。,*,（3）must表示推测时，可以推测现在/正在发生的动作*,（,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？,*,（4）在反意疑问句中，当附属部分含有表示推测意义的must时,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。,*,2.can/could的用法（1）can表示推测“可,（,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）could 还可以用于表示客气、委婉、礼貌的请求语气。,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。,*,3.may和might的用法（1）may,might,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.,*,情态动词表推测的三种句式 1.在肯定句中一般用must,10,2.,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。,*,2.否定句中用cant/couldnt(不可能),11,3.,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？,*,3.疑问句中用can/could(能?)。（1）,12,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,*,Choose the best answers:1.,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,*,2.That man must be Sarahs h,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,*,4.What_ it be?-It_,6.David,you _play with the valuable bottle,you_ break it.A.wont;cant B.mustnt;mayC.shouldnt;must D.cant;shouldnt,*,6.David,you _play with t,7.Sue_ come together with us tonight,but she isnt very sure yet.A.must B.may,C.need D.will,*,7.Sue_ come together w,
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