江苏省江阴市成化高级中学高中英语 Unit3 The world online Grammar and usage教案 牛津译林版选修7 (2).docVIP

grammar and usageauxiliary verbsteaching aims:1. lead the students to know about some basic information about auxiliary verbs (words used as auxiliary verbs; function of auxiliary verbs);2. enable the students to summarize usages of common and important auxiliary verbs; 3. apply what theyve learned about auxiliary verbs.teaching procedures: step 1 lead-in q: what are auxiliary verbs?a: auxiliary verbs are used in forming tenses, moods and voices of other verbs. theverbs used for this purpose include be, do, have and modals.step 2 introduction point out the auxiliary verbs.1. he doesnt like english. 2. he is singing. 1. he has got married. 4. he was sent to england. 5. did you study english before you came here? 6.do you like college life? 7. do come to the party tomorrow evening. 8. he did know that.step 3 presentation:auxiliary verbs 1. be（am/is/are/was/were/been）the small animals are kept in the cages.he is giving a lecture. the internet has too much information that has not been evaluated for accuracy.your house is bigger and nicer than mine. i am to go abroad on business tomorrow. tips: 1)be作为本动词表示状态或客观存在等意思。2)be +不定词连用, 表示约定、义务、命令等未来的动作或状态。3)be +现在分词构成各种进行时态。4)be +过去分词构成被动语态。5)be用于have/has/had后构成完成时。2. do（does/did）he didnt find any useful information on the internet.these errors do not occur as often when people use traditional reference materials.then, why does he come here? you do know a lot about computers.never did i see such a strange man. tip: 1)do作为助动词时的时态、人称和数的变化有do, does, did三种形式。2)do+主词+原形动词构成疑问句。3)do+not+原形动词构成否定句。4)do(+not)+主词用于附带问句。 5)do +原形动词用于加强语气句。6)never (only) 等+do+主词+原形动词用于倒装句3. have（has/had）i have never seen such a strange man. can i have my hair cut now? i often have my assistant help me do it.tip: 1)助动词have+过去分词构成完成时态。2)have +受词+过去分词表示请或让别人做某事。 3)have +受词+原形不定词表示请或让某人做某事。4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）(1)ok, i shall do what you said. you shall give me a cigarette, or i shall tell the boss. where shall i meet you? (2)you should work harder. you must put on more clothes in case you should catch a cold. (3)will you give me a cigarette? this will be what you need. she will stand there sleeping for hours. ok, i will do it. (4)can i help you, sir? i am checking out. could you give me the bill? of course we can wait. i cant help thinking of it. (5)must i go with you? no, you neednt. you mustnt forget your medical card. oh, it is wet outside. it must have rained yesterday. so it must be slippery outside. do be careful! you neednt have told me that much.(6)i dare not say it is ugly. how dare you say so? tip:1)shall用于陈述句，表诺言、决心、警告、强制等; shall用于询问对方意向。2)should表示义务，责任等。3)will用于第二人称疑问句中,询问对方意志或请求。will+原形动词用于所有人称,表意愿。would +原形动词表示过去一段时间的习惯。4)can, could在口语中相当于may, might,表示许可。can, could 表示能力,相当于be able to。can, could表示怀疑、推测,一般用于疑问句或否定句。can,could用于惯用语。cant help或couldnt help+动名词表示忍不住。5)must表示必须、义务等,强调主观因素。 need可以对must引导的一般疑问句作否定回答。 must的否定式表示不准,禁止等意思。 must+have+过去分词表示对过去情况的推断。must+原形动词表示对现在情况的推断。 neednt+have+过去分词表示过去不必做却已经做了的事。6)dare作为情态助动词，一般只能用于疑问句或否定句中。3. a phrasal auxiliary verbhave (got) to, had better/would sooner/rather ( than)/cannot (help) but do/be (not) to/be supposed to/ought to/used to/be about to/be able to ）its getting late. ive (got) to go now.you dont have to take off your shoes. many countries would rather be cautious with this new technology.the tickets had been sold out, so i could not (help) but go back home.the children are supposed to be at school before 8 a.m.i used to love cats but not now, because i was once attacked by a big black cat.he didnt use to smoke when he was younger.did he use to come as often as he does now?tip: have to 强调客观因素。would rather表示宁愿做某事。could not (help) but只能做某事。are supposed to应该做某事。used to 表示过去常常做