Unit 1 Food for thought Using language-Modals（ppt课件）-新外研版（2019）《高中英语》必修第二册.pptx

1、BOOK 2 BOOK 2 Unit 1 Food for thought Period 2 Using languageModals(1)ModalsModalsMeaningsMeaningsFunctionsFunctionsbe able todarehave tohad betterneedActivity 1 Match the Match the modalsmodals to their meanings,and summarize their to their meanings,and summarize their functions.functions.5 5abilit

2、ycouragestrong adviceadvicenecessity1 14 43 32 2Activity 2Read the introduction to an Read the introduction to an app,fill in the blanks with app,fill in the blanks with modals,and explain their modals,and explain their functions.functions.dare notneednthave tobe able toarent able tohad betterFreeFr

3、eebe afraid to do somethingnot be necessary to do somethingbe necessary to do somethinghave the ability to do somethingdont have the ability to do somethinggive advice to do somethingActivity 3have todare nothad betterneednt/dont have tobe able toComplete the tips for good table manners with the cor

4、rect forms of modalsWhat are modals?In English grammar,a modal,also known as a modal auxiliary or modal verb,is a verb that combines with infinitive without to(不带to的不定式)to express possibility,certainty,permission,request,ability,obligation,etc.a.Meaning:to indicate abilityUse be able to to fill the

5、blanks.Up till now,he _get in touch with her.You _speak perfect English very soon.I regret _help her.hasnt been able to will be able tonot being able to Whats the difference between be able to and can/could?Examples：He can swim.Im able to express my idea in a clear way.I could/was able to play the p

6、iano when I was young.They are used to indicate ability.ExamplesHe could swim across the river.Though he was sick,he was able to swim across the river.We could reach the top of the mountain.After five hours of climbing,we were able to reach the top of the mountain.Though he was sickAfter five hours

7、of climbingwas/were able to means that you succeeded in doing sth or managed to do sth in the past.Benny,the Polish scientist,has spent his lifetime studying active volcanoes and deep caves in all parts of the world.In 1948,he went to a lake in the Congo to observe a new volcano which he later named

8、 Kituro.Benny _ set up his camp very close to the volcano while it was erupting violently.Though he managed to take a number of brilliant photographs,he _ stay near the volcano for very long.He noticed that a river of liquid rock was coming towards him.It threatened to surround him completely,but Be

9、nny managed to escape just in time.He waited until the volcano became quiet and he _ return two days later.This time,he managed to climb into the mouth of Kituro so that he _ take photographs and measure temperatures.Benny has often risked his life in this way.He _ tell us more about active volcanoe

10、s than any man alive.was able tocouldnt/wasnt able to was able tocouldhas been able tob.Meaning:to be brave enough to do sth Dare he climb the tree?-No,he dare not.He dare not go there because it is very dangerous.He doesnt dare to cross the river.He dares to cross the river.ordinary verbc.Meaning:t

11、o indicate obligations.p have tois a semi-modal verb.It is like a modal verb because it fulfils a specific function,but it behaves like an ordinary verb in its formulation.It has different forms according to number,person and tense:I have to;he has to;she had to etc.c.Meaning:to indicate obligations

12、.Think:whats the negative form of have to?I dont have to.She doesnt have to.It can combine with other modal verbs:You will have to.He might have to.d.Meaning:to express suggestions,hopes and warningsForm:had better do sth Shed better get here soon,or shell miss the opening ceremony.They had better not be late.e.Meaning:to show that sth is necessary You neednt seem him,but I must.Need I finish the work today?You need to see him.The bike needs repairing/to be repaired.ordinary verb