1、Unit 1Food for thoughtUsing language情态动词（1）Look at the sentences from the reading passage.Think and work out the meanings of the words in bold.5.have the ability to do something1.be afraid to do something4.be necessary or give strong advice to do something3.give advice to do or not to do something2.
2、not be necessary to do something情态动词(1)情态动词表示说话人对某一动作或状态的看法或主观设想,是复合谓语不可或缺的部分。【基本特征】1.情态动词有一定的词义，不能单独作谓语，需和实义动词或系动词一起作谓语。*She can play the piano very well though she is seven.虽然她才7岁，但她弹钢琴弹得非常好。2.情态动词一般无人称和数的变化，个别情态动词有现在时和过去时两种时态变化。*They must be on the playground.他们一定在操场上。3.构成否定句时，not放在其后面。*I cant ca
3、tch the last bus.我赶不上末班公交车了。4.情态动词后接动词原形。*Reading can be a challenging task.阅读是一项富有挑战性的任务。1.be able to 后跟动词原形，表示具体的能力，与can 的用法相近。*Little Ted is not able to answer the teachers question.小泰德回答不了老师的问题。2.be able to与can的区别：(1)be able to 有更多的时态形式，can只有一般现在时和一般过去时两种时态形式。*Will you be able to come to my birt
4、hday party next Sunday?你下周日能来参加我的生日聚会吗?*I havent been able to get much work done today.我今天未能做多少工作。【be able to 的用法】(2)was/were able to do sth.表示过去成功做成了某事，相当于succeeded in doing sth.。could 仅表示客观上有某种能力，不说明实施该能力后的结果。*He was able to hold back his anger and avoid a fight.他忍住了怒气，避免了一场斗殴。*By the time she was
5、 eight,she could read Greek and Latin.她八岁就会读希腊文和拉丁文了。(3)be able to可用在 may/might,want 之后。*I want my grandma to be able to use a computer.我希望我的奶奶能使用电脑。*He may be able to leave hospital early next week.他下周初也许就可以出院了。1.have to 意为“不得不，必须”。后跟动词原形。*I have to be off now.The train is leaving in an hour.我得走了。火
6、车一小时之后就要开了。2.have to与must的区别：(1)must 强调说话者的主观意愿；have to 强调客观上的必要性。*The last bus left,and John had to walk home.最后一班公共汽车走了，约翰只好步行回家了。*I must finish the paper by noon.中午之前我必须完成这个论文。(2)mustnt 不许，不可以，表示禁止；not have to 不必。*You mustnt be late for the exam.你考试一定不要迟到。*Ann doesnt have to cook for herself.She
7、works at a hotel and gets all her meals there.安没有必要自己做饭。她在一家酒店工作，也是在那里用餐。【have to 的用法】had better 后跟动词原形，表示“最好”，其否定形式，是在 had better 后加 not。*You had better not talk with strangers.你最好不要和陌生人讲话。*Youd better not stay up late.你最好不要熬夜。*One had better see life in its various aspects when young.一个人最好在年轻时就能看到
8、生活的各个方面。【had better 的用法】need 和dare 既可用作情态动词，也可用作实义动词。用作情态动词时，主要用于否定句和疑问句中；用作实义动词时，可用于各种时态。(1)用作情态动词*How dare you ask me such a question?你怎么敢问我这样的问题？*Its not hot here;we neednt turn on the air-conditioner.这里并不热，我们没必要开空调。(2)用作实义动词*Heneedstoseeadoctor.Doyouneedtoseeonetoo?他要去看医生。你要去吗？*She does not dare
9、 to meet her teachers eyes.她不敢与老师对视。【dare 与 need 的用法】Activity 2:Underline the modals in the introduction to an app and talk about their meanings.【巩固练习】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 someth
10、ingarent able to:dont have the ability to do somethinghad better:give advice to do somethingActivity 3:Complete the tips for good table manners with the correct form of the modals in Activity 1 on Page 5.【巩固练习】While going on your first trip to the UK is exciting,new and different customs can also be
11、 confusing.Table manners are no exception.But dont worry here are some tips:You 1._wait until everyone else has been served before you start eating.Sometimes 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.When
12、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 hamburger or pizza.Just remember:when in Rome,do as the Romans do,
13、and you will 5._ enjoy the local cuisine!have todare nothad betterneednt/dont have tobe able toActivity 4:Fill in the blanks with the modals we have learned in class.(1)根据汉语意思，用 be able to 或 can 的正确形式填空。Judy _ play basketball as well as football.朱迪既会打篮球也会踢足球。Hesaidhe_ seemenextweek.他说他下周可以见我。_youple
14、aseturnitalittledown?请问您可以把声音调小一些吗？Mymom_beathomeatthistime.我妈妈现在不可能在家的。HedidntagreewithmeatfirstbutI_ persuade him.一开始他不赞成我的想法，但我还是说服了他。【巩固练习】could can/is able to Could cantwas able to Activity 4:Fill in the blanks with the modals we have learned in class.(2)根据汉语意思，用 have to 或 must 的正确形式填空。Mother i
15、s out,so I _ look after the shop.妈妈不在家，我不得不照看商店。You _ break the rules.你不要破坏规定。They _ buy a computer at present.他们目前没有必要买电脑。He _ have seen the film last night.他昨天晚上肯定看了那场电影。The composition is due to hand in this morning,so I _ finish it last night.作文今天早晨得上交，因此我不得不昨天晚上把它完成。【巩固练习】have to mustnt dont ha
16、ve tomusthad toActivity 4:Fill in the blanks with the modals we have learned in class.(3)用 had better,dare 或 need 的正确形式填空。We _ tell mother the truth.我们最好告诉妈妈实情。All you _ to do is complete this form.你需要做的就是填好这个表格。You _ pay the whole amount now.你没必要现在全部付清。He wont _ break his promise.他不敢食言。I _ say youre dull at home.我敢说你在家里感到沉闷无聊。【巩固练习】had betterneedneedntdare todare Thank you!
