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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,*,情态动词,Modal Verbs,情态动词是什么？,动词类别,系动词,情态动词,助动词,行为动词,能独立做谓语,不能独立做谓语,情态动词是什么？,必须要和其他动词连用；,可,表示说话人的语气，用来,表达建议、要求、可能和意愿等；,没有人称和数的变化。,常用情态动词,现在式,can,过去式,could,（能，可能）,现在式,may,过去式,might,（可以）,现在式,shall,过去式,should,（应该）,现在式,will,过去式,would,（会，将要）,must,无时态之分,had better、dare、need、ought to,情态动词,can/could,1.can表现,在的能力,I can swim,but my sister cant.,2.could,表,过去,的能力,At that time we thought the,story,could not be true.,3.Y,ou cannot smoke in the,meeting,room.,(,此句的,cannot,表示“禁止”,),情态动词,can/could,3.can/could,与,be able to,相比,be able to,可用于各种时态，表能力，强调成功地做某事,was/were able to,:,设法做成某事,相当于,managed to do sth,suceeded in doing sth,情态动词,may/might,1.may,表示请求别人允许,e.g.,May I use your bike?,2.may/might,表示可能性,e.g.He may be a teacher.,3.may,用于表示,应该(多用于法律条文,）,e.g.Payment may be paid by check.,情态动词,shall/should,1.,用,于第一、三人称，征求对方意见,e.g.Shall we go now?,What should we do next?,(用,should,比,shall,表示更客气),2.shall,用于法律、规定，表示义务和规定,8,.g.The sign reads:No person shall smoke here!,3.should,表示应该,e.g.You should not judge a man by his clothes.,情态动词,will/would,1.用,于向第二人称征求对方意见,(,would,比,will,更客气),e.g.Would you please open the door?,2.will表示个人主观意愿,e.g.I will help you anytime.,3.would,“,表过去常常,”,e.g.When he was there,he would go to that coffee shop every day.,注：,used to do,“,过去常常，强调现在不了,”,情态动词,must,1.,must,表必须,e.g.You must keep the place clean.,(务必),mustnt,禁止,e.g.When I was young,I was told that I mustnt play with fire.,2.must,还可表示,“,偏偏，偏要,”,e.g.Must you make so much noise?,情态动词,m,ust/have to,1.must 表示主观意愿，否定句用mustnt，否定回答用neednt,e.g.You mustnt play in the,street,.,Must I clean the room now?,No,you neednt.,2.have to表示客观条件的限制的“不得不”，它有时态和人称变化，需要助动词来否定和疑问。,e.g.I,dont,have to carry the big box.,He had to wash his clothes.,情态动词表推测,可能性的强弱层次,must should/ought to,can/could,may/might,1.should/ought to,表示推测,根据经验的推测，,“,应当、应该,”,e.g.Your photos should be ready by12:00.,表示,“,竟然,”,，带有感情色彩,e.g.It is incredible that you should like him.,can/could,表推测,1.,常,用于否定句和疑问句,e.g.He cant be at home.(否定句),Can the news be true?(疑问句),2.can,用于肯定句中表示理论上的可能性，并不涉及是否真的会发生,e.g.You can hurt yourself if you play in the street.,may/might,表推测,1.may well”极有可能”,e.g.Liza may well not want to go on the trip,because she dislikes travelling.,2.may/might as well”不妨”,e.g.You may as well try to do it.,can?may?must?could?might?,1.Jim _can_ sing very well.,2.Hello,_may/might_ I speak to Jim?,3.We are students.We _must_ work hard.,4._may/might_ I come in?,5.You _can_ talk in class.,
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