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1、GrammarModal verbs 情态动词情态动词 (II)Unit2 Healthy eating1.作为情态动词用，常用在否定句和疑问句中。Dare (need) +S +VS + darent (neednt) +VI darent walk through the forest at night.Dare you walk through the forest at night?You neednt return the book now.Need he go yesterday?可兼做行为动词的情态动词：可兼做行为动词的情态动词：need 、 dare 2.作实义动词用，常用在肯
2、定句中, 有人称、时态、和数的变化He needs to go there himself.He has grown up,we dont need to worry about him.3.Sth (sb) need( want, request)+ doing/ to be done The house needs cleaning/ to be cleaned The boy needs sending to the hospital at once.Our color TV set is still good enough. You neednt have bought a new o
3、ne.4.neednt have done 表示原本不必表示原本不必要做的事情却已经做了的情况要做的事情却已经做了的情况,意为意为“本不必要本不必要”Your home is not far from your school ,so you neednt have leftin such a hurry then. 5.注意对注意对need问句的回答问句的回答: -Need I finish the work today? -Yes, _. No, _. No, _.you mustyou needntyou dont have to-Must we do it now? -No, you _
4、. neednt(dont have to)情态动词的其他用法情态动词的其他用法may well + v = have good reason to (理所当然） You may well say so.may/ might as well = had better do.(最好。） You may as well say so.may as well +v.+as+v (与其.不如.) ( 最好 . 而不要 .）You might as well throw your money away as lend it to him.1. may1.Judging from his accident
5、, he must be from the south,2.It is eleven oclock at night and the lights are off. They must be sleeping now,isnt he? arent they?因因must后是系动词后是系动词 be must后接的是后接的是be sleeping，是对正在进是对正在进行的情况推测行的情况推测2.与与must有关句子的反意疑问句有关句子的反意疑问句1.We must have learned 2,000 words by the end of last term, hadnt we?3.He mus
6、t have gone to Beijing,didnt it?hasnt he? 若句中含有过去完成时的时间状语，用过去完成时完成反意疑问句若句中含有过去完成时的时间状语，用过去完成时完成反意疑问句若句中含有过去的时间状语，用一般过去时完成反意疑问句若句中含有过去的时间状语，用一般过去时完成反意疑问句若句中不含任何时间状语，若句中不含任何时间状语， 用现在完成时完成反意疑问句用现在完成时完成反意疑问句2.It must have rained last night, for the road was very muddy，.can not but+do sth 表示表示“不得不，只好不得不，
7、只好”。I can not but admire your bravery.我不得不钦佩你的勇气我不得不钦佩你的勇气 。I could not but choose to go.我只好去我只好去 。3. can1.判断正误判断正误: How dare you say such a thing? How dare you to say such a thing?He darent to speak English before such a crowd, did he?He darent speak English before such a crowd, dare he?Nobody need
8、 to be afraid of catching the disease.Nobody need be afraid of catching the disease.These dishes need be cleaned carefully.These dishes need to be cleaned carefully.These dishes need cleaning carefully.1.There was a lot of fun at yesterdays party. You_ come, but why didnt you? A. must have B. should
9、 C. need have D. ought to haveD2.I wonder how he_that to the teacher. A. dare to say B. dare saying C.not dare say D.dared sayD3.Chinese must have the largest number of speakers, _.A.mustnt they B. havent they C. dont they D. didnt theyC4.As it turned out to be a small house party, we _ so formally.A neednt dress B. didnt have to dress upC. Might not have dressed up D. neednt have dressed upDThank you!
