Unit 3 Grammar ppt课件-（2019）新外研版高中英语高一必修第三册.pptx

1、Present Perfect Tense & Present Perfect Passive VoiceLead in Lets watch a video and think about the questions. 结构：have/has done 一、用法（1）表示过去发生或完成的某个动作对现在造成的影响或结果，强调的是 这个影响或结果。Eg: I have just turned off the light. I have already read the book.（2）表示从过去开始、持续到现在并可能持续下去的动作或状态。Eg: She has worked in the sch

2、ool for ten years. I havent eaten anything since breakfast.二、现在完成时常见的时间状语（temporal adverb）：yet, already, just, before, recently, so far , up to now, till now , for+段时间, since+点时间, in the last/ past years等.Time Line过去过去+现在现在易错点和易考点易错点和易考点1.与过去时的区别与过去时的区别语义/落脚点是否可+具体时间（ago, yesterday,）eg. I lived in T

3、ai Yuan last year. I have lived in Tai Yuan.拓展：拓展：2.have been to 与与 have gone to的区别的区别have been to表示曾经去过 eg. 我去过北京。have gone to 表示已经去了 她去了北京。3. 常考固定句式常考固定句式1. Although he has retired, every now and then he often recalls his teaching life. After all he _(work) as a teacher for 35years.2. Since then,

4、the Chengdu Plain _(be) free of flooding and the people have been living peacefully and wealthily.3. This is the first time that I _(watch) a play.4. It _(be) six years since I came here.5. In the last few years, China _(make) great achievement in environmental protection.6. I _(read) half of the En

5、glish novel, and Ill try to finish it at the weekend.7. Oh No! We are late. The train _(leave).Please observe these sentences on our textbook 1. I guess you have been asked about the title of your book before. 2. Computer advances have been made in medicine.3. Ive also been told that you are an inve

6、ntor yourself. 1. I guess you have been asked about the title of your book before. 2. Computer advances have been made in medicine.3. Ive also been told that you are an inventor yourself. 现在完成时的被动语态意义及结构现在完成时的被动语态意义及结构表示动作发生在过去表示动作发生在过去, 到现在已经完成或对现在产生的影响。到现在已经完成或对现在产生的影响。动词和被修饰主语构成被动关系。动词和被修饰主语构成被动关

7、系。肯定式：肯定式：否定式：否定式：一般疑问句一般疑问句：特殊疑问句特殊疑问句：have/has + been + v-ed（两个助动词）（两个助动词）have/has + not + been + v-edHave/Has +主语主语+ been +v-ed?疑问词疑问词+have/has +been+ v-ed?Task 5 learn more about the present perfect passive 肯定式否定式一般疑问句特殊疑问句 主语+ have/has been done主语+have/has not been doneHave/ Has+ 主语+ been done?

8、疑问词+ have / has+ 主语+been done?Eg: How to change the present perfect into the passive sentences?1. We have learned many useful words so far.Many useful wordshave been learned(by us)主语主语主语so farSummary: 主动态句子变为被动态时，宾语变为主语，谓语动词主动态句子变为被动态时，宾语变为主语，谓语动词由主动变为被动，其他成分不变，主动态的主语由由主动变为被动，其他成分不变，主动态的主语由by引导放在句后，

9、可以省略。引导放在句后，可以省略。谓语谓语Eg:2.The company has given him a chance to work abroad recently. 主语谓语间宾直宾定语He has been given a chanceto work abroad recently (by the company)Summary: 带双宾语的句子，如send, give, bring, teach, show, tell, buy, lend, pass等，变为被动态时，一般将间接宾语变为被动态的主语，若将直接宾语变为被动态主语，间接宾语前要用相应的介词。A chance to wor

10、k abroad has been given to him recently (by the company.) Change the following sentences into passive voice. They have resolved conflicts so far. Professor Li has persuaded him to quit smoking. He has found a temporary job to support his study . 4. Volunteers have made ten wells up to now to help th

11、e African people.Conflicts have been resolved so far.He has been persuaded to quit smoking by professor Li.A temporary job has been found by him to support Ten wells have been made up to now to help5. I have asked her to help you.6. Tom has taught us English for 10 years. 7. He has sent me an e-mail

12、.She has been asked to help you (by me)We have been taught English for 10 years (by Tom.)I have been sent an e-mail (by him.)Change the following sentences into passive voice.填空（用适当形式填空）Paper money _ _ (use) for over a thousandyears.2. We (decide) when and where to go for the paid holiday yet. When

13、and where to go for the paid holiday _ _ _(decide) by us yet.3. 主动变被动His grandma has taken good care of the child all these years. The child _ _ _ _ _ _ by his grandma all these years.have not been decidedhas been taken good care of 做题方法：做题方法：1. 确定谓语确定谓语/非谓语非谓语2. 谓语（时态，语态，谓语（时态，语态，主谓一致主谓一致）have not

14、decidedhas been used.用所给词的适当形式填空1. I like these English songs and they _ _ (teach) many times on the radio.2. She said, “This is the first time that I _(see) the moonlight since I came here.3. It is already three years since he _(work) in this company4. In recent years some Inuit people in Nunavut _

15、 (report) increases in bear sightings around human settlements, leading to a belief that populations are increasing.5. Great changes _ _ (take place) in myhometown and a lot of factories _ _ (set up).我的家乡已经发生了很大的变化，建起了很多工厂。have been taughthave seenworkedhave reportedhave taken placehave been set upConclusion