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Unit,3,Grammar and usage,Auxiliary verb,Unit 3,課件描述：,學生將學會： 1）什么是助動詞（用于協(xié)助主要動詞構成謂語動詞 詞組的詞，自身沒有詞義，不可單獨使用）。 2）助動詞的功能（a. 表示時態(tài)；b. 表示語態(tài)；c. 構成疑問句；d. 與否定副詞not合用，構成否定 句；e. 加強語氣 ）。 3）最常用的助動詞（be, do, have and modals (shall, will, should, would) ）。,,Auxiliary verbs are used in forming tenses, moods and voices of other verbs. The verbs used for this purpose include be, do, have and modals.,What are auxiliary verbs?,1. He like English. 2. He singing. 3. He married. 4. He sent to England. 5. you like college life? 6. you study English last year? 7. come to the party tomorrow evening. 8. He know that.,doesn’t,Auxiliary verbs,is,has got,was,Do,Did,Do,did,be（am/is/are/was/were/been） do（does/did） have（has/had ） modals（shall/should/will/would/can/ could/may/might/must/need/dare ） A phrasal auxiliary verb（have (got) to, had better/would sooner/rather ( … than)/cannot (help) but/be (not) to/be supposed to/ought to/used to/be about to/be able to）,Auxiliary verbs,Auxiliary verbs,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.,1. be（am/is/are/was/were/been）,Auxiliary verbs,Tip: be作為本動詞表示狀態(tài)或客觀存在等意思。 be +不定詞連用, 表示約定、義務、命令等未來的動作或狀態(tài)。 be +現(xiàn)在分詞構成各種進行時態(tài)。 be +過去分詞構成被動語態(tài)。 be用于have/has/had后構成完成時。,1. be（am/is/are/was/were/been）,Auxiliary verbs,He didn’t find any useful information on the Internet. These kinds of 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.,2. do（does/did）,Auxiliary verbs,Tip: do作為助動詞時的時態(tài)、人稱和數(shù)的變化有do, does, did三種形式。 do+主詞+原形動詞構成疑問句。 do+not+原形動詞構成否定句。 do (+not)+主詞用于附帶問句。 do +原形動詞用于加強語氣句。 Never (Only) 等+do+主詞+原形動詞用于倒裝句。,2. do（does/did）,Auxiliary verbs,I have never seen such a strange man. Can I have my hair cut now? I often have my assistant help me do it.,3. have（has/had）,Tip: 助動詞have+過去分詞構成完成時態(tài)。 have +受詞+過去分詞表示請或讓別人做某事。 have +受詞+原形不定詞表示請或讓某人做某事。,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,,Ok, I shall do what you said. I shall never do such a thing. You shall give me a cigarette, or I shall tell the boss. Where shall I meet you?,,You should work harder. You must put on more clothes in case you should catch a cold.,Auxiliary verbs,,Will you give me a cigarette? This will be what you need. She would stand there sleeping for hours. Ok, I will do it.,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,,Can I help you, sir? I am checking out. Could you give me the bill? Of course we can wait. Could it be the charge for the fruit? I can't help thinking of it.,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare） Must I go with you? No, you needn't. You mustn't forget your medical card. Oh, it is wet outside. It must have rained yesterday. So it must be slippery outside. Do be careful! You needn't have told me that much.,Auxiliary verbs,,,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,,I dare not say it is ugly. How dare you say so?,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,Tip: shall表示發(fā)言者的意志,包括諾言、決心、強制等; shall用于詢問對方的意向。 should表示義務，責任等。 will用于第二人稱疑問句中,詢問對方意志或請求。will+原形動詞用于所有人稱,表意愿。would +原形動詞表示過去一段時間的習慣。,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,Tip: 4） can, could在口語中相當于may, might,表示許可。can, could 表示能力,相當于be able to。can, could表示懷疑、推測,一般用于疑問句或否定句。can, could用于慣用語。can’t help或couldn’t help+動名詞表示不得不、忍不住。,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,Tip: 5) must表示必須、義務等,強調主觀因素, have to, 強調客觀因素。 need可以對must引導的一般疑問句作否定回答。 must的否定式表示不準,禁止等意思。must+have+過去分詞表示對過去情況的推斷。must+原形動詞表示對現(xiàn)在情況的推斷。 needn't+have+過去分詞表示過去不必做卻已經做了的事。,4. modals（shall/should/will/would/can/ could/may/might/must/need/dare）,Auxiliary verbs,Tip: 6) dare作為情態(tài)助動詞，一般只能用于疑問句或否定句中。,5. A phrasal auxiliary verb（have (got) to, had better/would sooner/rather (… than)/cannot (help) but/be (not) to/be supposed to/ought to/used to/be about to/be able to）,Auxiliary verbs,5. A phrasal auxiliary verb,Auxiliary verbs,It’s getting late. I’ve (got) to go now. You don’t 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.,5. A phrasal auxiliary verb,Auxiliary verbs,I used to love cats but not now, because I was once attacked by a big black cat. He didn’t use to smoke when he was younger. Did he use to come as often as he does now?,Answers to Part A (p41),1. have 2. haven’t 3. don’t 4. didn’t 5. was 6. did 7. did 8. didn’t 9. wouldn’t have 10. will,Answers to Part B (p41),1. was about to 2. used to 3. wasn’t able to 4. was supposed to 5. could not help but 6. would rather,1. Review what we have learned in class. 2. Go over the exercises in class. 3. Finish the workbook exercises (P120).,Homework,