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2019-2020年高一英語下冊 Unit14 Festivals(第五課時)教案 大綱人教版第一冊 Teaching Aims: 1.Review the usages of modal verbs which express“obligation”. 2.Sum up some other main usages of these modal verbs. Teaching Important Points: 1.How to correctly use modal verbs which express“obligation”. 2.How do tell the differences between“must”and“have to”and between“mustnt”and “dont have to”. 3.How to understand the meaning of the structure“should/ought to+have+p.p.”. 4.How to correctly use the negative forms of“had better”,“ought to” and “have to”. Teaching difficult Points: How to correctly choose modal verbs in different situations. Teaching Methods: 1.Review method and inductive method to enable the students to make clear what theyve learned. 2.Practice to make the students master what theyve learned correctly. Teaching Aids: a projector and some slides;a multimedia Teaching Procedures: Step Ⅰ. Greetings Greet the whole class as usual. Step Ⅱ. Lead-in T:In these two units,we learned to use some modal verbs to express“obligation and duty”and to give advice about something.Please tell me what they are? Ss:They are must,have(got)to,had better,should and ought to. (Teacher writes them on the Bb.) T:Yes.Now lets do an exercise.(Teacher shows the screen.) 1.When travelling,you__________take care of your health. 2.In some parts of the world,you__________boil the water before drinking it. 3.If you have a stomach pain,you__________drink hot weak tea. 4.You__________take this medicine,but your head may hurt less if you do so. 5.You__________swim immediatly after a heavy meal. 6.You__________not wake me up when you e in. Now look at the sentences on the screen and fill in each blank with the modal verbs on the blackboard.Lets finish them together orally. Suggested answers: 1.should/must　2.must/have to　3.should/ought to　4.dont have to　5.should not/ought not to/must not　6.had better Step Ⅲ. Revision of the Usages of the Modal Verbs T:Well done.As we all know,“must,should and ought to”all express obligation and duty.When“must”expresses obligation and duty,it is much more forceful than“should”and“ought to”.It expresses very emphatic advice.For example:The work must be finished before dark.“Must”is only used in affirmative sentence and an interrogative sentence to express obligation and duty.Then what should we use in a negative sentence? Ss:Dont have to,neednt or dont need to. T:Why dont we use“mustnt”? Ss:“Mustnt”expresses“be forbidden”. (Bb:must,dont have to,neednt,mustnt) T:Now please look at the exercise on the screen and choose the best answer.(Teacher shows the screen.) —Must I do it now? —No,you__________. A.neednt　B.dont have to C.mustnt　D.A or B Ss:D. T:Yes.It is D.We cant use “mustnt”to express obligation and duty.Are you clear about that? Ss:Yes. T:Do you know the difference between“must”and“have to”? S1:Yes.“Must”expresses an obligation imposed by the speaker,while“have to”expresses an external obligation. S2:Besides,“have to”can be used in all tenses,while“must” can only be used to express the present tense and the future tense. T:Then how about the difference between“have to”and “have got to”? S3In informal English,“have got to”is used instead of“have to”. T:Quite right.Now please look at the sentences on the screen.(Teacher uses multimedia to show the sentences on the screen and study them with the students.) 1.That boy has to practise the piano every day. 2.You will have to keep your dog on a lead when you are travelling. 3.He lost all his money and I had to lend him $5. 4.Children must obey their parents. 5.I must go home to look after my mother. (Bb:has to,will have to,had to,must.) T:OK.“Must”can also express“guess”when we want to say that we are sure about something.“Must”is only used in this way in affirmative sentences.In questions and negatives,we use“can”and“cant”instead.We can use“must/cant +be+doing”to express the present continuous situation and can use“must/cant +have done”to express the situation which has already happened.Lett look at some sentences on the screen.(Teacher shows the screen and help the Ss understand them.) He must be ill,for he looks so pale. It must be raining outside. It must have rained last night.The ground is wet. He cant be ill.I saw him playing basketball just now. What do you think this letter can mean? (Bb:must/cant+do/be doing have done.) (After that,teacher goes on to revise the usages of“should”“ought to”and “had better” with the Ss.) T:Next,lets revise the usages of “had better”“should”and“ought to”.All of them can be used to talk about obligation and duty,but they are much less forceful than“must”.They can be used to give advice or opinion about something,in general to say what we think it is right or good for people to do.We know“had better”is less strong than“should”or “ought to”.Then who can tell me if there is any difference between“should”and“ought to”? S4:In most cases,both“should”and“ought to”can be used with more or less the same meaning.There is,however,a very slight difference.“Should”generally means“in my opinion,it is your duty.”“Ought to”can be slightly stronger than“should”when it is used to refer to regulations or duties imposed from the outside. T:Quite right.Do you know the negative forms of them? Ss:Their negative forms are separately“shouldnt”, “ought not to”and“had better not”. (Teacher writes the negative forms on the Bb.) T:Correct.Now lets look at some sentences on the screen. You should study first aid with a teacher. You ought not to write so carelessly. Oughtnt we to give him a chance to try? Youd better hurry up if you want to get home before dark. Youd better not look at this. T:(After the above.)Besides,we use“should”or“ought to”with the perfect infinitive to talk about things which did not happen,although they were supposed to,and we use their negative forms with the perfect infinitive to talk about things which happened,although they were not supposed to.Please look at the sentences on the screen. I ought to have taken those books back to the library last night. You should have realized that she was joking. She ought not to have sold the ring. You shouldnt have given him the money. (Bb:should(not)/ought(not)to+have done) T:Moreover,“should”and“ought to”can also be used to talk about strong probability.Look at the examples on the screen. Its nice oclock.He should be at home,I think. Ive bought thirty pints of beer—that ought to be enough. Note that“should”and“ought to”are used to talk about the present and future,not the past. Step Ⅳ. Practice T:OK.Now lets do some exercises to consolidate what we have learned.Please look at the screen. Ⅰ.Fill in the blanks using have to,must,should,ought to,had better. 1.You__________not get down until the bus has stopped. 2.They__________be encouraged to speak English after class. 3.You often__________ __________wait a long time for a bus. 4.We__________ __________go and see Mary tomorrow,but I dont think we will. 5.I __________ __________ not miss my train. Suggested answers: 1.must　2.should　3.have to　4.ought to　5.had better Ⅱ.Correct the mistake in each sentence. 1.You have better hurry up. 2.The taxi should arrive to 8:30,but it didnt turn up. 3.That mustnt be the postman—its only seven oclock. 4.People ought vote even if they dont agree with any of the candidates. Suggested answers: 1.have—had　2.should arrive—should have arrived　3.mustnt—cant　4.ought—ought to Step Ⅴ. Summary and Homework T:Today weve revised the usages of modal verbs“must,have to,had better,should and ought to”.All of them can be used to talk about obligation and duty,to give advice or opinion.Also we have revised their other main usages,such as,the difference between“must”and“have to”,the difference between“should”and “ought to”,the usages to express possibility and the structure“should(not)/ought(not)to have done”.You must remember them correctly and practise more.Thats all for today.Bye. Ss:Bye. Step Ⅵ. The Design of the Writing on the Blackboard Unit 14　Festivals The Fifth Period Ⅰ.must,have to,have got to 1.must/will have to/had to/has to 2.mustnt/neednt/dont need to/dont have to 3.must/cant+do/being done/have done Ⅱ.should,ought to,had better 1.shouldnt/ought not to/had better not 2.should/ought to have done should not/ought not to have done Step Ⅶ. Record after Teaching _____________________________________ _____________________________________ _____________________________________ _____________________________________