Unit 4 情态动词ppt课件（2020）新牛津译林版高中英语必修第二册.pptx

1、Unit4 Exploring LiteratureCantneedneedModal verbsHow do you explain modal verbs?情态动词情感态度 情态情态动词，即表示人的动词，即表示人的情感和态度情感和态度的动词。的动词。The features of Modal verbs情态动词的特征没有人称和数的变化;其否定形式在后面直接加not情态动词后接动词原形What Modal Verbs do you know?Modal verbscouldmaymightshallshouldhave tomustwouldwillcanDESIGNED BY Mr.Fan

2、Can 和 Could1. 表能力uHe can eat a bucket of rice.uCan the news be true?uI think it cant be true.2. 表推测，“可能” ，用于疑问句或否定句uCan/Could I use your dictionary?uCould you lend me a hand?3. 表请求或许可（表请求时，could比can语气更委婉）Jack _ swim when he was born NEXTJack couldnt swim when he was born but he _ swim really fast no

3、w.NEXTMy aunt _jump high. She was the best.NEXTMay 和 Might1. 表许可或征询对方许可 May I come in? Where is he from? He may/might from Chenzhou.2.表把握不大的推测，”或许”可能”，常用于肯定句，might比may可能性小(口语中常用might代may表委婉语气) Yes, you may.No, you mustnt.NEXTNEXTshall 和 should(1)用于第一、三人称的疑问句，表征求对方的意见(2)用于第二、三人称的陈述句，表命令、警告等1.shall2.s

4、hould(1)表劝告、建议，“应该”(2)表推测，“想必一定，按理应该”(3)用于表示惊异、赞叹、不满, ”竟然”竟会”uWhy should you be so late today？uThe young should respect the old.uThey should be there by now.uShall I pick you up tomorrow?uYou shall do as I tell you.It is too late,_we begin our meeting? Its sunny and hot today.They _ put some sun cre

5、am on.Its a great film.You _ go and see it.will 和 would1. 表意志、意愿uWould you like a cup of tea?2.表请求或建议，would比will委婉、客气uI will tell you all about it.uWill you lend me your book?uIll never do that again.(2)must的否定形式为must not (mustnt), “不准” “禁止”must 和 have to(1)表义务、必要性、命令等，“必须”u The work must be finishe

6、d as soon as possible.u You mustnt smoke in public places.1.must Must I be home before nine oclock, Mum? Yes, you must.No, you neednt/dont have to.u You must be tired after such a long walk.(3)表把握很大的肯定推测，“一定，准是”，一般只用于肯定句中must 和 have tonhave to的意思接近must，must更强调说话者的主观意愿；have to强调客观上的必要性，“不得不”2.have to

7、- Must he come to sign this paper himself?- Yes, he . A. need B. must C. may D. will BThe last bus left,and I _walk home.had to公众号：Englishare ought to 表义务，意为“应该”（因责任、义务等该做），语气比should稍重。uYou are his father. You ought to take care of him.uYou oughtnt to smoke so much. 双性动词need, dare 1. need 可以作实义动词或情态

8、动词。可以作实义动词或情态动词。 We need to finish the job before dark. u You neednt hurry as theres plenty time left. 2. dare可以作实义动词或情态动词。可以作实义动词或情态动词。 He dared to travel abroad when he was young. u How dare you let your little child go out alone? Can/Could表能力表能力表推测表推测表请求、许表请求、许可可May/Might表推测表许可Shall/Should征求意见（一、

9、三）？命令、警告（二、三）。表建议（应该）表推测（想必一定）表惊讶、赞叹、不满“竟会”Will/Would表意愿表建议would比will 更委婉Must/Have to 表义务、必要性（必须）表推测客观/主观Ought to因责任义务（应该）Need/Dare双胞胎希望所有人都能被这个世界温柔以待。May everyone be treated gently by the world .用适当的情态动词填空：1.I can play football. _you swim?2.Dont worry. You _ return me this book tomorrow.3.My grandma is ill. You _ talk so loudly here .4.I cant play with you. I _finish my homework first.5.I_ get up early tomorrow. because I have a meeting.6._you please open the window? Canmay/cancantmusthave toCan/Could