Unit 1 Understanding ideas Grammar （ppt课件）-2022新外研版（2019）《高中英语》必修第二册.pptx

1、Unit 1 Food for thoughtPeriod 2 Grammar:modalsa.I was able to hold a knife and fork-and chopsticks!b But there are still some dishes that Dad dare not try even after many years of marriage to my mother.c.Mum and I just have to find a way to get him into the kitchen!d.wed better not eat too much roas

2、t food as it may make us suffer from heat inside our bodies,.e“You neednt try it if you dont want to,Mum said,.Step 1 Lead in Read the sentences and pay attention to the words in bold.Activity 1 Match the words in bold with the meanings.24351情态动词表示说话人的语气和情态，如需情态动词表示说话人的语气和情态，如需要，可能，愿意和怀疑等，有一定的意义，要，可

3、能，愿意和怀疑等，有一定的意义，但不完整，必须和动词原形一起构成谓语，但不完整，必须和动词原形一起构成谓语，常见的情态动词有：常见的情态动词有：can,could,may,can,could,may,might,must,ought to,shall,will,might,must,ought to,shall,will,should,wouldshould,would，had betterhad better及半情态动词及半情态动词need,dare,need,dare,be to do,have to,be be to do,have to,be able to able to。情态动词的

4、主要特征：情态动词的主要特征：1.有一定的词义，但不能单独作谓语。它们要和有一定的词义，但不能单独作谓语。它们要和行为动词或连系动词连用构成谓语。如：行为动词或连系动词连用构成谓语。如：He may come tomorrow.2.没有人称与数的变化（没有人称与数的变化（have to/need除外）。除外）。3.后面接动词原形，即不带后面接动词原形，即不带to的不定式（的不定式（ought to,have to,used to本身带本身带to）。）。4.具有助动词的作用，即可构成否定句、疑具有助动词的作用，即可构成否定句、疑问句及用于简明答语。问句及用于简明答语。Activity 2 Und

5、erline the modals and talk about their meanings.dare not be afraid to do somethingneednt not be necessary to do somethinghave to be necessary to do somethingbe able to have the ability to do somethingarent able to dont have the ability to do somethinghad better give advice to do somethingStep 3 Prac

6、ticehave todare nothad betterneednt/dont have tobe able toStep 2 Presentation情态动词情态动词（Modal Verbs)can/could/be able to may/might will/would shall/should/ought tomust/have toneed/darehad betterFunction of modelsability 能力能力possibility 可能性可能性advice 建议建议agreement 赞同赞同guessing 猜测猜测necessity 必要性必要性permis

7、sion 许可许可prediction 预测预测promise 许诺许诺request 请求请求past habit 过去习惯过去习惯can/could Jim isnt very good at maths or science,but he can speak English very well.Our history test was so long last week that no one could finish it.It was the last day of school,but the teacher said that we could not leave early.T

8、he hunters have been lost for days.They could starve.Could you please show me the way to Beihai Park?可能性可能性能力能力请求请求可能性可能性能力能力may/might What award did you get for the sports competition?May I have a look?Our football team didnt play very well today,but we might do better tomorrow.请求请求 许可许可可能性可能性 Duri

9、ng the Spring Festival time the whole family will come for dinner.My uncle was poor but liked fashion,so he would often dress up as a rich man.Are you free this Saturday?Would you like to join my family for dinner?will/would许诺许诺请求请求过去习惯过去习惯预测预测 The harvest festival begins on Saturday.We shall be the

10、re with our friends.When going by plane,you should arrive at the airport at least one hour early.Its nearly time for class to start.The teacher should be here soon.shall/should许诺许诺建议建议预测预测 When you eat fish you must be careful with the bones.Wang Feng has won the English competition three times.He m

11、ust be very smart.A man landed on Mars?You must be joking.That cant be true.must/cant建议建议 必要性必要性猜测猜测猜测猜测1.may/might 1)表示许可表示许可(疑问句疑问句)。表示请求，允许时，表示请求，允许时，might 比比may 的语气委婉。否定回答时，的语气委婉。否定回答时，可用可用can 或或 mustnt,表示表示“不可以，禁止，阻止不可以，禁止，阻止”之意。之意。-May I take this book out?-Yes,you can./No,you cant(mustnt).2)用

12、于祈使句，表示祝愿用于祈使句，表示祝愿 May you succeed!3)表示推测，可能（不用于疑问句）表示推测，可能（不用于疑问句）The bottle looks blue.There may/might be some ink in it.2.can/could 1)表示能力或客观可能性表示能力或客观可能性 I can draw a horse in five minutes.Man cannot live without air.2)表示请求或允许。表示请求或允许。could 表示请求时语气较委婉，主要用于表示请求时语气较委婉，主要用于疑问句，但回答时应用疑问句，但回答时应用can

13、-Could I call you by your first name?-Yes,you can.3)用于否定句和疑问句，表示推测。用于否定句和疑问句，表示推测。The young girl cant/couldnt be our new chairman.Can the news be true?3.will/would 1)表示请求，建议等，表示请求，建议等，would 比比will 委婉客气委婉客气 Would you pass me the book?2)表示意志，愿望和决心表示意志，愿望和决心 I will never do that again.3)would 可以表示过去反复发

14、生的动作或某种倾向。可以表示过去反复发生的动作或某种倾向。During the vacation he would visit me every week.4)表示估计或猜想表示估计或猜想 I thought he would have told you all about it.4.shall/should 1)shall 用于第一、第三人称时，表示征求对方的意愿或向对用于第一、第三人称时，表示征求对方的意愿或向对方请求。方请求。Shall we go for a picnic this weekend?2)shall 用于第二、第三人称时，表示说话人给对方的命令、用于第二、第三人称时，表示

15、说话人给对方的命令、警告、警告、允诺或威胁允诺或威胁 You shall fail if you dont work harder.3)should 表示劝告、建议或命令表示劝告、建议或命令 You should obey the rule in any case.4)should表示推测表示推测 He should be at the reading room now.5.must 和和 can 的用法的用法1)must表示必须、必要或用以征求对方意见。回答表示必须、必要或用以征求对方意见。回答must 引引导的问句时，其否定回答要用导的问句时，其否定回答要用neednt 或或dont ha

16、ve to.-Must we hand in our exercise books today?-Yes,you must./No,you dont have to(you neednt).2)must 表示推测，用于肯定句中。表示推测，用于肯定句中。This must be your pen.(1)Look!Theres a light on Dr.Bakers office.He _ be working in his office.(2)It _sound strange,but it is true.(3)When I was young,I _ sing for hours.(4)-

17、When can I come for the photos?I need them tomorrow afternoon.-They _ be ready by 12:00.(5)Mr.Bush is on time for everything.How _ it be that he was late for the opening ceremony?mustmaywouldshouldcan(6)A bear _ not touch a dead body.(7)-There were already five people in the car but they managed to

18、take me as well.-It _ not have been a comfortable journey.(8)Johnny,you _play with the knife,or you may hurt yourself.(9)Professor Wang,many students want to see you._ they sit here or outside?(10)-Are you coming to Jeffs party?-Im not sure.I _ go to the concert instead.willcouldmustntShall may/migh

19、t must have done 表示对已经发生事情的肯定猜测。表示对已经发生事情的肯定猜测。“必定已经必定已经”should/ought to have done 表示表示”本来应该做到本来应该做到,但实际未做但实际未做到到”，常含有责备口气，常含有责备口气。（否定形式表示（否定形式表示”本不该做而做本不该做而做了了”）may/might have done,本可以做而没做，突出可能性。本可以做而没做，突出可能性。can/could have done 表示有能力或有可能做而实际没有做。表示有能力或有可能做而实际没有做。cant/couldnt have done,表示对已经发生事情的否定猜

20、测。表示对已经发生事情的否定猜测。neednt have done 本不必做的事却做了。本不必做的事却做了。难点对比难点对比1.I didnt see her in the meeting room this morning,She couldnt have spoken at the meeting.2.I didnt hear the phone.I must have been asleep.3.You should have told me about it earlier.4.I could have helped you if you had asked me.Step 3 Practicehave todare nothad betterneednt/dont have tobe able toThank You