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

1、外研版（2019）英语 必修二01020304Discovering the rulesStudying the rulesApplying the rulesExercise01Look at the sentences from the reading passage.Think and work out the meanings of the words in bold.a.I was able to hold a knife and forkand chopsticks!b But there are still some dishes that Dad dare not try ev

2、en 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 roast food as it may make us suffer from heat inside our bodies，.e“You neednt try it if you dont want to，”Mum said，.01Discovering the rulesNow talk about the fu

3、nction of modals.Then match the meanings to the words in bold above.1 be afraid to do something 2 not be necessary to do something 3 give advice to do or not to do something 4 be necessary or give strong advice to do something 5 have the ability to do something a-5b-1c-4d-3e-201Discovering the rules

4、Underline the modals in the introduction to an app Underline the modals in the introduction to an app and talk about their meanings.and talk about their meanings.Healthy Eating Trainer Health&Fitness （96）DownloadDetails Reviews RelatedIf you dare not try a“painful”diet to stay healthy，this new app i

5、s the perfect solutionand you neednt pay for it!The app works by quickly showing photos of different food.All you have to do is select the photos of healthy food.Then youll be able to train your brain to select healthy food in real situations.So，if youre a sugar addict and arent able to say no to ch

6、ocolate or cola，you had better download it now!Soon,youll be filling your cupboards with real healthy food.01Discovering the rules If you dare not（be afraid to do something）try a“painful”diet to stay healthy，this new app is the perfect solutionand you neednt（not be necessary to do something）pay for

7、it!The app works by quickly showing photos of different food.All you have to（be necessary to do something）do is select the photos of healthy food.Then youll be able to（have the ability to do something）train your brain to select healthy food in real situations.So，if youre a sugar addict and arent abl

8、e to（dont have the ability to do something）say no to chocolate or cola，you had better（give advice to do something）download it now!01Discovering the rules情态动词 情态动词表示说话人的某种语气或情绪，如可能、意愿、猜测、义务、需要等。情态动词有一定的词义，但不能单独作谓语，后面接动词原形；没有人称和数的变化（be able to，have to 除外）；有些情态动词有过去式，如：cancould，maymight，willwould，dared

9、ared，have tohad to 等。02Studying the rules1.be able to be able to 后接动词原形，表示某人做某事的能力，可用于大多数时态。用于过去时态时，还可表示“某人过去或当时成功地做了某事”。I will be able to speak German in another two months.再过两个月我就能说德语了。I havent been able to read that report yet.我还没能看那份报告。They were able to escape from the building when the fire bro

10、ke out.火灾发生时,他们设法从大楼里逃了出来。02Studying the rules【用法辨析】can与 be able to（1）can 与 be able to 都表示能力，在许多情况下可以交替使用。但can 只有现在式和过去式（could），而be able to 则有更多的形式。（2）can 一般指自身具有的能力，而如果要表达将来的能力，一般要用will be able to。（3）be able to 的过去式 was/were able to 在肯定句中可表示过去设法做成了某事，相当于managed to do，而could 则无此意义。02Studying the rul

11、es2 dare 意为“胆敢，敢于”，既可作情态动词，又可作实义动词。（1）dare 作情态动词时，没有人称和数的变化，但有过去式dared，后接动词原形，否定式为dare not/darent，多用于否定句或疑问句。I am so afraid that I dare not move.I am so afraid that I dare not move.我害怕得不敢动。我害怕得不敢动。Dare you tell her the truth?Dare you tell her the truth?你敢告诉她真相吗？你敢告诉她真相吗？She dared not breathe a word

12、of it to anybody.She dared not breathe a word of it to anybody.她对任何人都只字不提此事她对任何人都只字不提此事02Studying the rules【学法点拨】情态动词dare 可用于以下结构：I dare say.我想/我认为 How dare you.?你怎么敢？I dare say he will fail.我认为他会失败。How dare you say such a thing?你怎么敢说这样的话？（2）dare 作实义动词时，有时态、人称和数的变化，后接带作实义动词时，有时态、人称和数的变化，后接带to 的不定的不定

13、 式，否定式要在其前加式，否定式要在其前加dont/doesnt/didnt。不定式符号。不定式符号to 有时可以省略。有时可以省略。I am so afraid that I dont dare to move.我害怕得不敢动。我害怕得不敢动。Do you dare to fight him?你敢和他对抗吗？你敢和他对抗吗？He didnt dare（to）say what he thought.他不敢说出他的想法。他不敢说出他的想法。02Studying the rules一句多译她晚上不敢一个人出去。（1）（dare 作情态动词）（2）（dare 作实义动词）她晚上敢一个人出去吗？（3）

14、（dare 作情态动词）（4）（dare 作实义动词）She dare not go out alone at night.She doesnt dare（to）go out alone at night.Dare she go out alone at night?Does she dare（to）go out alone at night?02Studying the rules完成句子完成句子（5 5）He wanted to ask herHe wanted to ask her，but he but he （不敢）（不敢）（6 6）（我认为）（我认为）you have known a

15、bout it already.you have known about it already.（7 7）（你竟敢用）（你竟敢用）my car without asking!my car without asking!dared not/didnt dare I dare say How dare you use 02Studying the rules3 have to 表示“必须，不得不”，是由于客观情况而“必须”，have to 的否定形式dont have to 表示“不必”，可用于各种时态中。They had to had to put off the sports meeting

16、because of the bad weather.由于天气不好，他们不得不推迟运动会。You dont have to dont have to knockjust walk in.不必敲门进来就是了。I have to have to learn another language.我不得不学另一种语言。（客观情况使得）I must must learn another language.我必须学另一种语言。（说话人的意愿）You dont have to dont have to tell others.你不必告诉别人。You mustnt mustnt tell others.你不准告

17、诉别人。02Studying the rules4 had better 意为“最好”，主要用来表示劝告或建议。用于一般现在时或一般将来时，适用于所有人称，否定式为had better not。had better do sth.had better do sth.最好做某事最好做某事had better not do sth.had better not do sth.最好不要做某事最好不要做某事We had better call in a specialist at this critical moment.We had better call in a specialist at th

18、is critical moment.在这个关键时刻我们最好请一位专家来。在这个关键时刻我们最好请一位专家来。You had better not do that.You had better not do that.你最好不要那样做。你最好不要那样做。Wed better not just talk and lets help them.Wed better not just talk and lets help them.我们最好不要光说不做，让我们来帮助他们。我们最好不要光说不做，让我们来帮助他们。02Studying the rules5 need 意为“需要，有必要”，既可作情态动词

19、，又可作实义动词。（1）need 作情态动词时，没有人称和数的变化，后接动词原形，常用于否定句或疑问句中，否定式为need not/neednt，意为“不必”。neednt have done 表示实际上做了本来不必做的事，意为“本来不必”。You neednt finish that work today.你不必今天做完这项工作。Need I pay the whole amount now?我必须现在全部付清吗？You neednt have worried about the dinner it was delicious!你原本不必为这顿饭担心的味道棒极了！02Studying the

20、 rules（2）need 作实义动词时，有人称和数的变化，后接名词、代词、动名词、带to 的不定式，用于陈述句、否定句或疑问句中均可，否定式和疑问式要借助助动词do/does/did。need 作实义动词时常用于下列句式：sb.need（s）to do sth.某人需要做某事（主语与do 为主动关系）sth.need（s）doing/to be done 某事/某物需要被（主语与do 为被动关系）【误区警示误区警示】以以need 开头的疑问句，否定回答可用开头的疑问句，否定回答可用neednt，肯定回答用，肯定回答用must。以以must 开头的一般疑问句，肯定回答用开头的一般疑问句，肯定回

21、答用must，否定回答用，否定回答用neednt 或或dont have to。02Studying the rulesWhile going on your first trip to the UK is exciting，new and different customs can also be confusing.Table manners are no exception.But dont worryhere are some tips：You 1 wait until everyone else has been served before you start eating.Some

22、times there are so many knives and forks that you 2_ pick them up in case you get it wrong.The trick is to start with the ones on the outside.have to dare notComplete the tips for good table manners with the correct form Complete the tips for good table manners with the correct form of the modals in

23、 Activity 1.of the modals in Activity 1.03Applying the rules When you finish your meal，you 3 place the knife and fork together on your plate with the handles at the four oclock position.Table manners，however，can differ in different situations.For example，you 4 use a knife and fork when eating a hamb

24、urger or pizza.Just remember：when in Rome，do as the Romans do，and you will 5 enjoy the local cuisine!had better needntbe able to Complete the tips for good table manners with the correct form Complete the tips for good table manners with the correct form of the modals in Activity 1.of the modals in

25、Activity 1.03Applying the rules（1）The police are doing all they to find her.（2）You must speak French for this job.（3）This time I failed the exam，but Ill pass the exam next time.（4）The fire was very big，but most people escape from it.can be able to be able to were able to 选词填空（选词填空（be able to/canbe a

26、ble to/can）04Exercise（5）I give you details because I dont actually have any details.（6）He come again tomorrow because he is busy.（7）When he was young，he swim very fast.（8）Im sorry I answer your letter in time.（9）He said that Tom get there on time because he got up late.cant wont be able to havent be

27、en able to could wasnt able to/couldnt 04Exercise（1）This book not be removed from the library.（2）Jackie is ill so they change their plans.完成句子（3）She （必须自己做）.I wont help her.（4）She （不得不自己做）.She has got no one to help her.（5）You （千万别说）things like that.（6）You （不必说）things like that to me.must have to mu

28、st do it herself has to do it herself mustnt say dont have to say 选词填空（选词填空（have to/musthave to/must）04Exercise完成句子（1）I think you （最好去找医生看看）about your cough.（2）We （最好现在就走）or well miss the bus.（3）Before getting the drivers license，you _（最好不要驾驶）the car on the road.had better go to the doctorhad better

29、 leave now had better not drive 04Exercise（1）I love the weekend，because I （不必早起）on Saturdays and Sundays.（2）（我需要召集）the children together at once?（3）We （不必打扮）.The party has been called off.（4）I was a little nervous when I announced my engagement to Grace，but I _ （本来不必担心）.（5）Must I ask for her permission?No，（你不必）.neednt get up early Need I gatherdont need to dress up neednt have worried you neednt/dont have to 完成句子完成句子04Exercise