单击此处编辑母版标题样式,单击此处编辑母版文本样式,二级,三级,四级,五级,2020/3/9,#,U3,语法讲解,U3语法讲解,1,学习目标及内容,Grammar Focus,（情态动词,can,和,could,的用法）,学习目标及内容Grammar Focus,2,情态动词基本用法,1.,情态动词,表示说话人的语气或情绪,2.,情态动词,无人称和数的变化,3.,情态动词,后跟动词原形,常见的情态动词,：,must,can,may,shall,might,should,will,would,need,could,等。,情态动词基本用法1.情态动词表示说话人的语气或情绪,Could I,stay out late?,Could I,use the car?,Sorry,you cant.I have to go to a meeting.,Could I,get a ride?,No,you have a test tomorrow.,Yes,you can.,Grammar,想得到对方的,许可,Could I/we.?,Could I stay out late?Could I,Could you please clean your room?,Yes,sure.,Could you please do the dishes?,Sorry,I cant.I have to do my homework.,表达请求,Could you(please).?,Could you please clean your ro,1.,情态动词,could,表示请求,委婉地,请求,别人做某事。,常用句型,Could you(please)do sth.?,肯定答语,Yes,sure./Yes,I can./Of course,I can./No problem./With pleasure,否定答语,可先拒绝，再说明理由：,Sorry,I cant,.I have to/Sorry,Im going to/Im afraid I cant.I have to,委婉地请求别人允许自己做某事。,常用句型,Could I do sth.?,肯定答语,Yes,you,can,./Yes please.,否定答语,Sorry,you,cant,./Im afraid you cant.,（然后说明理由）等,1.情态动词could 表示请求委婉地请求别人做某事。常用,6,【,典例,1】_ I borrow your dictionary?Yes,of course you _.,A.Can;could B.Could;can,C.Can;can D.Could;could,考查情态动词。句意：,我可以借用一下你的字典吗？,当然可以。表示“委婉请求”选用,could,，需要用,can,来回答。故答案选,B,。,【典例1】_ I borrow your dic,1.,Need/Must,I,.?,mustnt,禁止,2.May I,?,3.Can/Could,更加委婉,you,?,含,情态动词,表达请求,的几组特殊的问答：,Yes,you must,必须,.,No,you _.,（不必,=dont have to,）,Yes,you,may/can,.,灵活回答,sure,OK,等,Sorry,you _.(,不可以,),Yes,I _.,灵活回答,sure,OK,等,.,Sorry,I cant.+,理由。,neednt,不需要,cant,mustnt,(,不准,),can,含情态动词表达请求的几组特殊的问答：Yes,you mus,8,eg:,1)I can swim,now,but I,couldnt,swim,before,.,2)He,can,have a speech in public,公众，公共场合,now,but he,couldnt,when he,was,a little boy.,3),He,said,that he,couldnt,come.,他说他不能来了。,2.could,为,can,的过去式，表示能,会，可以（过去的）。,eg:2.could 为can 的过去式，表示能,会，可以,4a,Write,R,for,requests,and,P,for,permissions,.Then match each one with the correct response.,_ Could I hang out with my,friends after the movie?,2._ Could you please pass me,the salt?,3._ Could I borrow that book?,a.Yes,here you are.,b.Hmm.How much do you,need?,c.Yes,sure.No problem.I finished reading it last night.,P,R,P,4._ Could you help me do the,dishes?,5._ Could you lend me some,money?,d.Yes,but dont come back,too late.,e.No,I cant.I cut my finger and Im trying not to get it wet.,R,R,4aWrite R for requests and P f,could,的句式结构,肯定句：,could,+,动词原形,否定句：,could,后加,not,（缩写为,couldnt),一般疑问句：,could,提前,I,could,speak English when I was three.,I,couldnt,speak English when I was three.,Could,you speak English when you were three?,could的句式结构肯定句：could+动词原形否定句：,小结,could,的用法,2.,表示过去一般的能力,，意为“,能、会,”。,1.,表示委婉请求，意为“,可以,吗,”。,3.,表示,猜测,时，意为“,可能,”。,Could,you speak English then?,Could,I use your pen?,You,could,be right,but I dont think you are.,小结could的用法2.表示过去一般的能力，意为“能、会”。,must,“,一定”把握大的肯定猜测。,may/might,/could,“,可能,/,或许”把握不大的猜测（,肯否均可）,。,cant,“,不可能”把握大的否定猜测。,After a long walk,you _ feel tired.,The man _ be Tom.He left here yesterday.,My mom _ go the visit grandpa but I am not sure of it.,The note book _ be Marys because you can see her name on it.,must,cant,may/might/could,must,知识延伸：,could,及相关,情态动词,表猜测：,must,13,当堂测试,I.,单选,()1.John_ come to see us tonight,but he isnt very sure yet.,A.may B.can C.has to D.must,()2.They _ do well in the exam.,A.can be able to B.be able to C.can able to D.are able to,()3.,Can you speak Japanese?,No,I_.,A.mustnt B.cant C.neednt D.may not,()4.,Must I do my homework at once?,No,you_.,A.neednt B.mustnt C.cant D.may not,当堂测试I.单选,14,()5.May I go swimming now?,-No,you _.You should finish your homework first.,A.mustnt B.may not C.couldnt D.neednt,()6._ I finish the work today?-No,you neednt.,A.May B.Must C.Can D.Could,()7._I visit Lucy on Sunday,Mum?-Yes,you_.,A.Must,；,can B.May,；,can,C.Need,；,need D.May,；,need,()8.Dad,let me fetch you one more cake,OK?,-Thanks,but you_,Ive had enough.,A.may not B.mustnt C.cant D.neednt,()5.May I go swimming now,15,Homework,1.,自学,SectionB1a-1c,勾画疑点，并完成导学预习,2.,背单词,U3SectionB,前,10,个,3.,笔记整理：,could,用法及相关知识联系和拓展,Homework,16,