Unit 2 Let's Celebrate! Using language （ppt课件） -新外研版（2019）《高中英语》必修第二册.pptx

1、The children must have been very excited as they opened it.The children could have been very excited as they opened it.they might not receive their presents if they were not good.they could not receive their presents if they were not good.surenot so surepossibleimpossible情态动词情态动词对现在和未来的推测对现在和未来的推测 对

2、过去的推测对过去的推测使用句型使用句型MustMust+动词原形Must have done肯定句May/mightMay/might+动词原形 May/might have done肯定句，否定句Can/could Can/could+动词原形Can/could have done 否定句，疑问句（could可用于肯定句）should用来表示一种估计的情况“按理会+估计会”should+do/beShould have done 肯定句，否定句，疑问句表推测时，英语中只使用表推测时，英语中只使用must,may,might,may not和和cant这五个表达的语气依次递减：这五个表达的语气

3、依次递减：must：一定（语气肯定）：一定（语气肯定）may：也许（不很肯定）：也许（不很肯定）might：或许（比：或许（比may语气更弱）语气更弱）may not：也许不（表否定）：也许不（表否定）cant：一定不（：一定不（must的反义）的反义）情态动词情态动词+动词原形动词原形1)can+动词原形动词原形A.用于肯定句用于肯定句,表示客观可能性表示客观可能性,意为意为“可能可能”,即从理论上看是可能的即从理论上看是可能的,但不一定会发生。但不一定会发生。例如例如:As a human being,anyone can make a mistake.作为人类作为人类,任何人都有可能犯错

4、。任何人都有可能犯错。B.用于否定句或疑问句用于否定句或疑问句,表示对现在的动作或状态进行主观的猜测表示对现在的动作或状态进行主观的猜测,意为意为“可能可能”,或表示或表示惊异、怀疑等态度。例如惊异、怀疑等态度。例如:a.He cant have a lot of money.他不可能有很多钱。他不可能有很多钱。b Can it be that it was l,not he,who was mistaken?难道是我弄错了难道是我弄错了,而不是他弄错了而不是他弄错了?情态动词情态动词+动词原形动词原形2)may+动词原形动词原形,表示主观的推测表示主观的推测,意为意为“或许或许”,用于肯定句

5、和否定句均可。例如用于肯定句和否定句均可。例如:a.He may be very busy now.他现在可能很忙。他现在可能很忙。b.He may not be at home.他可能不在家。他可能不在家。注意注意:表示可能性时表示可能性时,cant语气较强语气较强,表示表示“不可能不可能”;may not语气较弱语气较弱;表示表示“可能不可能不,或许不或许不”。3)might+动词原形动词原形,表示推测表示推测,意为意为“可能可能,可以指过去的情况可以指过去的情况,也可以指现在的情况也可以指现在的情况,但语但语气比气比may更加不肯定。用于肯定句或否定句均可。例如更加不肯定。用于肯定句或否

6、定句均可。例如:a.They might have a lot of work to do now but Im not sure.他们现在可能有很多活儿要干他们现在可能有很多活儿要干,不过我不确定。不过我不确定。b.She was afraid they might not like the idea.她担心他们可能不喜欢这个想法。她担心他们可能不喜欢这个想法。情态动词情态动词+动词原形动词原形4)could+动词原形动词原形,意为意为“可能可能”,可以指过去的情况可以指过去的情况,也可以指现在的情况也可以指现在的情况,语气缓和。多语气缓和。多用于否定句或疑问句。例如：用于否定句或疑问句。例

7、如：a.He looks young.He couldnt be over 50.他看起来很年轻他看起来很年轻,不可能超过不可能超过50岁。岁。b.Could it be true?那可能是真的吗那可能是真的吗?5)must+动词原形动词原形,表示猜测表示猜测,意为意为“准是准是,一定一定”,通常用于肯定句。例如：通常用于肯定句。例如：a.This must be your room.这一定是你的房间。这一定是你的房间。b Look at his new car.He must have a lot of money.瞧他那辆新车。他肯定很有钱。瞧他那辆新车。他肯定很有钱。情态动词情态动词+完

8、成式完成式1)must+完成式完成式,表示对已发生情况的推测表示对已发生情况的推测,通常用于肯定句。例如通常用于肯定句。例如:She must have gone home.她肯定已经回家了。她肯定已经回家了。2)can+完成式完成式,表示对已发生情况的推测表示对已发生情况的推测,主要用于否定句或疑问句。主要用于否定句或疑问句。例如：例如：a.You cant have forgotten her.你不可能已经忘记她了。你不可能已经忘记她了。b.Where can she have put it?她到底把它放在哪儿了呢她到底把它放在哪儿了呢?情态动词情态动词+完成式完成式3)could+完成式

9、完成式,表示对过去情况的推测表示对过去情况的推测,多用于否定句或疑问句。多用于否定句或疑问句。例如：例如：a.He could not have been more than 16 at that time.他当时不可能超过他当时不可能超过16岁。岁。b Could she have forgotten my address?她会忘记我的地址吗她会忘记我的地址吗?4)may/might+完成式完成式,表示对已发生事情的不肯定的推测表示对已发生事情的不肯定的推测,mght相比相比may语气更加不语气更加不肯定。肯定。例如：例如：He may/might have come by train.他可

10、能是坐火车来的。他可能是坐火车来的。You must be tired now!It may/might/could be him.be Lucy.That must may/might/could be from our school.They that cant be Lucy.Possible versions:The woman in red must be very excited to buy so many things.The man with a wallet in his hand might be a bit reluctant to pay.The woman with

11、 glasses may be very tired to get up so early and carry so many bags.The cashier might be feeling uncomfortable as he is sweating a lot.a scarfa red enveloperice ballsballoonspostershold a lantern fairlet off fireworkshold a lantern riddles competitiona dresschocolatesdumplingsnoodlesbannersflowersp

12、aradehave a reunion dinnerAssignment:Introduce the Lantern Festival to Mr.and Mrs.White,who are interested in traditional Chinese culture,and invite them to join you to celebrate it.Dear Mr.and Mrs.White,Im sure you must have heard of the Spring Festival,which is the most important festival in Chine

13、se culture.However,the Lantern Festival may sound unfamiliar to you.Please allow me to introduce it to you.The Lantern Festival is on the fifteenth day of the first month in the lunar calendar.It marks the final day of the traditional Chinese New Year.During the festival,we our houses posters and Ch

14、inese paper-cuts.We and with thousands of people taking part in these celebrations.However,it is the busiest time for the traffic police because the lantern fair a lot of people every year.On the Lantern Festival,families gather to enjoy abig dinner,watch the Lantern Festival Gala,and catch up on ea

15、ch others recent life.Would you like to come to celebrate the Lantern Festival with us,and experience the festive atmosphere by yourself?If you can make it,Im sure you can have a lovely memory of it.Yours,sincerelyTo celebrate the Mid-Autumn Day,we usually have a few days off.It is a great occasion

16、for a family to get together.During the festival,we often drink some wine.Besides,there is a kind of traditional Chinese foodmoon cakes.The whole family usually admire the moon as they eat moon cakes.People often visit their friends and relatives with some delicious moon cakes and some fresh fruits.This festival is one of the most important festivals in China,which is held to celebrate the harvest,so no matter how busy they are,people usually have a thorough cleaning and decorate their house with some beautiful pictures about moon and so on.