英語人教新課標(biāo)必修五 Unit 3 Life in the future情態(tài)動詞課件（15張ppt)

1、Revision for Modal Verbs 2情態(tài)動詞的?？键c1.was/were able與could的用法區(qū)別2.must與have to的區(qū)別3. would 與 used to用法比較4.may must need引導(dǎo)問句的回答5.表示推測的情態(tài)動詞用法6.表示請求的句式7.dare 和 need 的兩種詞性的不同用法8.Will的用法9.情態(tài)動詞+have done用法10.情態(tài)動詞的特殊用法3The basic uses of Modal Verbs 6、Dare 7、Need 8、ought to 9、三點說明 10、典型錯誤 1、Can / could 2、May / m

2、ight 3、Must 4、Shall / should 5、will / would 41. Can 表示能力 The parrot can speak three languages.表示請求、允許 Can I borrow the book from the library.表示可能性 Shanghai can be very cold in March.Could 過去式；語氣更委婉2. Can 與 be able toCan 表示習(xí)慣能力， 而be able to表示經(jīng)過那里而做成了某事。2. 在否定結(jié)構(gòu)中，二者可以互換。3. can./could + have +p.p1.在否定、

3、疑問句中表示“對過去發(fā)生行為 的可能性猜測。2. 在肯定句中表示“本來可以做而未做”The door was lacked. She couldnt have been at home.You could have been more careful.51. May 表示可能性表示允許表示祝愿Might 過去式；語氣更委婉2. may/might + have +p.p1.在否定、肯定句中表示對過去動作的推測 “也許是”2. Might+have+p.p表示虛擬，表“勸告、責(zé)備之意?！盓g. 1. She may be still waiting for us. 2. May I come i

4、n? 3.May you have a happy holiday.Eg. 1. He might have spoken to her yesterday. 2. You might have told me earlier.61. Must 表示肯定的猜測,但只用于肯定句，而mustnt 表示“禁止、不準(zhǔn)”eg:the car is my property;you musnt use it without my permission.3.“偏要，非要不可”eg: If you must go,at least wait until the storm is over.4.表示必須、應(yīng)該2.

5、 Must 、have to 與have got toMust表示主觀Have to表示客觀需求Have got to 多見于口語3. must + have +p.p對過去事情的肯定猜測。Eg. The road is wet. It must have rained last night.71、Shall /should 1、第一、三人稱疑問句中表示“請求 或征求對方意見。Eg. Shall I get you a cup of coffee?2、第二、三人稱陳述句中1、表示說話人的命令，警告、威脅、允諾“會（得到），決心等；用于條約，規(guī)定，法令等。eg：You shall be puni

6、shed for what you have done.2、should表示出乎意料的口氣，意為竟然，居然Such a gentleman should do that.2、shall/should + have +p.p ought to表示本應(yīng)該做而未做。should 過去式 語氣更委婉Eg. You should have been five minutes ago.8Will/ would 1、表示意愿 Ill try my best to overcome the difficulty.2、表示意圖What will you do?3、表示請示、請求，建議 Will you help

7、 me to put these books in order?4、表示習(xí)慣動作She will sit for hours without saying a word.Would 與 used to 1、Would 后只能接表示動作的動詞。2、used to 則還可以接表示狀態(tài)的動詞。Eg. He used to be a worker.91、情態(tài)動詞用于否定、疑問句；條件從句中。 eg. 1. Dare you go here alone? 2. How dare you do such follish things? 3. I wont allow you to swim in the

8、river, even if you dare do it. I dare say 我想，大概Dare / dared2 、做實意動詞后加不定式。 eg. I have never dared to tell him about it. 10Need /needed 1、情態(tài)動詞用于否定句，疑問句。2、實意動詞用法似dare,用作不定式。3、need + not + have +p.p 表示“本來不需要做而做了。11Ought to 1、其否定式為ought not to2、ought to + have + p.p 表示本來應(yīng)該做而沒有做到。Eg. You ought not to have

9、 cut away the trees around the old building.3.表示義務(wù)，意為“應(yīng)當(dāng)”，語氣比should 強(qiáng)，表示不十分或含蓄地推測，意為“應(yīng)是，應(yīng)該”Eg :You ought to work harder than before.12三點說明1、情態(tài)動詞 + v 表示對現(xiàn)在或?qū)韯幼鞯牟聹y。 情態(tài)動詞 + have + p.p表示對過去動作的猜測。2、情態(tài)動詞的過去式與原形相比，多點禮貌，少點冒昧， 語氣更為委婉。情態(tài)動詞在一般疑問句中的回答： Can you sing? May I come in? Must I handin the book now? N

10、eed I finish it now?Yes, I can.No, I cant.Yes, you may.No, you mustnt.Yes, you must.No, neednt /dont have to.Yes, you must.No, you neednt.13典型錯誤1. He mustnt be in the classroom. ( )Cant2. You might leave the bag on the bag. ( )might have left3. You must have seen the film last week, havet you? ( )didnt you 4. Li ming must have been to Japan, didnt he