外研版（2019）必修第二册Unit 1 Food for thought Section B Using language课件(30张ppt)

(共30张PPT)
Unit 1 Food for thought
Section B Using language
1.function
词性：_________ 意思：________
function as …起……作用，具有……功能
A war injury has made his left hand stop functioning.战争中的伤使他的左手丧失了正常功能。
On weekdays, one third of the room functions as workspace.在工作日,这个房间的三分之一充当工作场所。
练习：交流得一个重要功能是在彼此不太了解的人之间建立一种关系。
________________________________________________
An important function of communication is to establish a relationship between people who don't know each other well.
2. manner
常见搭配
table manners餐桌礼仪
have good/bad manners有/没有礼貌
in a(n)…manner 以……方式
归纳拓展
表示“方法，方式”的词语积累：
method: a method for/of… ……的方式
way: in a(n)…way 以一种……方式；
a way of doing sth./a way to do sth.做某事的方法
means: by means of…依靠……方法；
means of(doing)sth.(做）某事的方法
approach: an approach to...……的方法
练习：Tai chi is performed with a series of beautiful movements_______（慢慢地）and deep breathing.
in a slow manner
3. recommend
recommend…to sb.向某人推荐……
recommend sb.for...推荐某人做……(跟一份工作）
recommend doing sth.建议做某事
recommend sb.to do sth.建议某人做某事
recommend that...建议………(从句谓语用“should+动常见搭配词原形”，should 可省略）
It is recommended that...建议……(从句谓语用“should+动词原形”，should可省略）
练习：The doctor recommended that we _______ (take) exercise regularly to keep fit.
(should) take
4. attack
词性：_________ 意思：________
under attack 受到袭击
make an attack on…攻击……
have a heart attack 心脏病发作
练习：The soldiers received the order to make an attack _______ the enemy at dawn.
on
Pre-class
Leading in
Activity 1:
Find out the sentences with modals in the reading passage.
① ...I was able to hold a knife and fork—and chopsticks!
② But there are still some dishes that Dad dare not try even after many years of marriage to my mother.
③ ... Mum and I just have to find a way to get him into the kitchen!
④ …we'd better not eat too much roast food as it may make us suffer from heat inside our bodies, …
⑤ "You needn't try it if you don't want to," Mum said,...
While-class
1. What are modal verbs
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。
2. What are the characteristics
of modal verbs
情态动词的特征：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(have to除外)；有些情态动词有过去式，如：can一could, may一might, will—would, dare—dared, have to—had to等。
情态动词
1. be able to 的用法
be able to表示 “经过努力而成功地做成某事”，有人称和时态的变化，不能与can连用。
It took me a long time before I was able to fully appreciate what they had done for me.
Tough though the task was, we were able to finish it ahead of time and therefore we were praised for it.
If we keep trying, we will be able to achieve our goals.
2. have to 的用法
have to表示"不得不，必须"，强调客观上的必要性。否定式为 don't/doesn't/didn't have to。
We don't have to rush -there's plenty of time.
have to有人称和时态的变化。
He has to pass an examination before he can start work.
Yesterday morning I had to call on a friend.
If you earn more than 5,000,you will have to pay tax.
3. had better 的用法
had better表示 “应该，最好”，没有人称和时态的变化。其否定式是had better not。
We'd better leave now or we'll miss the bus.我们最好现在就走,否则就赶不上公共汽车了。
You'd better not tell Oliver the news.你最好不要告诉奥利弗这个消息。
4. dare 的用法
dare作情态动词常用于疑问句、否定句及条件句中，表示“敢于，胆敢”，没有人称变化，但有过去式。
He daren't speak English in public.他不敢在公共场合说英语。
She dare not say what she thinks.她不敢把她想的说出来。
dare也可以做实义动词，其用法如下：
做实义动词时，有人称，时态和数的变化；
在肯定句中，其后常接带to的不定式；
在否定句和疑问句中，既可接带to 的不定式，也可接不带to的不定式；
否定式和疑问句时，要借助do does did等助动词。
He dares to challenge all kinds of difficulties.他敢于挑战各种困难。
He doesn't dare(to)go there alone.他不敢自己去那里。
5. need 的用法
need作情态动词多用在疑问句和否定句中，表示“需要”，没有时态和人称的变化。
If she wants anything, she need only ask.
This is free service; you needn't pay for it.
对need引出的一般疑问句作肯定回答时要用must，作否定回答时要用 needn't或don't have to。
-Need I hand in the application now
-Yes, you must./No, you don't have to.
Conjecture of modal verbs
1.can用于肯定句中表示客观的可能性，意为“有时会”；用于疑问句中可以表示推测，意为“可能”，有时表示一种惊讶的语气；用于否定句中也可以表示推测，can't意为“不可能”，语气很强烈。
2.may/might用于肯定句中可以用来表示不十分肯定的推测，意为“有可能”；用于否定句中也可以表示推测，may not意为“可能不”，表示一种不太确定的语气。
3.must表示推测时只能用于肯定句中，意为“一定，必定”，表示十分肯定的语气(在疑问句中或否定句中要用can/could)。
4.should用来表示推测时意为“应该”，即含有“按道理来说应当如此”的意思。情态动词+动词原形：表示对现在或将来的推测情态动词+be +doing：表示对某刻正在发生的动作的推测
情态动词+have done 用法
must have done 一定做过某事，其否定形式为can't/couldn't have done
can/could have done 1.本来能够做某事却未做 2.可能做过某事
can't/couldn't have done 不可能做过某事
may/might have done 或许/可能做过某事
should/ought to have done 本该做某事却未做，其否定形式表示本不该做某事却做了
needn't have done 做了本没有必要做的事情
①他准是个美国人。
________________________________
②他肯定正在教室里做练习。
________________________________
③他不可能知道我的地址。
________________________________
④昨晚一定下雨了，是不是
________________________________
He must be an American.
He must be doing his exercises in the classroom.
He can't know my address.
It must have rained last night, didn't it
① You'd better put on a heavy coat. Sometimes it_______ be very cold here at night.
②It_______ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
③-Good morning. I've got an appointment with Miss Smith in the Personnel Department.
-Ah, good morning. You______ be Mrs. Peters.
④You________ have hurried. I have lots of time.
can
couldn't
must
needn't
After-class
Miss Fang ______ not read for very long with her eyes hurt. Her mother told her that she_____ go to hospital and see a doctor. “You ______ see a doctor as soon as possible,” her mother said.
When Miss Fang had free time, she went to hospital. The clerk said that the doctor ______ see her at 3:30.
Miss Fang replied that she would not_______ be there at 3:30, because she______ have an important test then. She asked the clerk if she______ arrange the examination at about ten tomorrow.
答案：
could; should; had better; could; be able to; had to; could
Thanks