The Fifth PeriodModal VerbsTeaching Aims:1.Review the important usages of modal verbs.2.Sum up the different situations of modal verbs.Teaching Important Point:How to use modal verbs correctly.Teaching Difficult Point:How to choose modal verbs correctly.Teaching Methods:1.Review method to master the important usages of modal verbs.2.Inductive method and comparative method to master the important and difficult points.Teaching Aids:1.the multimedia2.the blackboardTeaching Procedures:CStep GreetingsGreet the whole class as usual.CStep RevisionT:In this unit,we have done some practice about modal verbs.As we know,modal verbs have several points in common which make them quite different from other verbs.Now,please discuss the points in common among modal verbs in groups of four.After a while I will check your answers.(Teacher gives students enough time to discuss,and then collects their answers and sums them up.)Modal Verbs:1.Modal verbs are used when we say that we expect things to happen or that things are possible,or necessary,or impossible,or improbable,or when we describe things that didnt happen,or that we are not sure whether they happened.2.Modal verbs have no -s on the third person singular.Questions and negatives are made without “do”.3.Modal verbs have no infinitives.4.Modal verbs have no past forms.“Could” and “would” are used with past meanings in some cases.5.Modal verbs can be used with perfect infinitive to talk about things which didnt happen,or which were not sure about.CStep Revision of the Important Usages of Modal VerbsT:Good work.As we all know,modal verbs can be classified into eight groups according to their usages.Today we will review some important usages of modal verbs.Firstly,lets review the modal verbs that can be used to express “possibility”.Please tell me which modal verbs can be used to express “possibility”.Ss:Can/could/may/might all express “possibility”.T:When they express “possibility”,they are not quite the same.“Can” is used to talk about theoretical possibility.If we want to talk about the actual chances of something happening,or being true,we use “could/may/might”.Besides,“can” is sometimes used to talk about present “possibility”,but only in questions and negative sentences.Is that clear?Ss:Yes.T:Now,lets do some exercises to master them better.Look at the screen and try to finish the sentences as soon as possible.(Teacher uses multimedia to show the sentences on the screen.)Fill in the blanks using can/could/may/might.1.Would you like to answer the phone?It _ be your sister.2.The part of the country _ be very warm in September.3._ it be Lily?4.It _(not) be true.5.You _ be right.Suggested answers:1.could/may/might 2.can 3.Can 4.cant 5.may/might/couldT:Besides “possibility”,can/could/may/might are also used to express “permission”.Yes?Ss:Yes.But we are not sure about how to use them.T:It doesnt matter.I will give you some explanation.“Can” is the commonest one of the four,and “could” is rather more hesitant than “can”.“May” and “might” are used in a more formal style.They often suggest respect.“Might” is more hesitant and is not very common.Besides,when we give permission,we usually use “can” and “may”,but not “could” and “might”.When we report permission,“may” is not usually used.Are you clear about it?Ss:Yes.T:Then try to finish the following exercises,please.(Teacher shows the exercises on the screen.)1._I use your phone?Yes,of course.You _.2._ you come into the meeting room without showing a passport?3.Mary said that I _ borrow her car.Suggested answers:1.Can/Could/May/Might;can/may2.Can3.might/could（“Might” and “could” can be used after a past verb.)T:Next,which modal verbs do you think are necessary to review?Ss:The modal verbs expressing “necessity”.They are very important.T:Yes,I agree with you.We can use “must/have to/have got to/need” to express “necessity”.But about how to use them,I want you to review them by understanding the following sentences by yourselves.Look at the sentences on the screen.(Teacher shows the sentences on the screen,and then asks some questions.)1.I really must study hard.2.You must be here by 3 oclock.3.You have (got) to go and see the manager.4.You neednt work on Sundays.T:From the sentences,who can tell me the difference between “must” and “have to”?S1:I want to have a try.When “must” is used,the necessity comes from the speaker.If the necessity comes from “outside”,“have (got) to” is more common.T:Congratulations!Do you know how to use “need”?S2:I think in negative sentences,“dont need to”,“neednt” or “dont have to” is used to say that there is “no necessity”.T:Please give me an example.OK?S2:I know the reason why you were late.You neednt try to explain.T:Thank you.In addition,I want to tell you “have got to” is used instead