外研版（2019）必修第二册Unit1 Food for thought- Grammar Modal Verbs1课件20张PPT

(共20张PPT)
Unit 1 Food for thought
Using language
Modals (1)
情态动词的语法特征
* 情态动词有一定的词义，但不能单独做谓语, 后面只接不带to的不定式，即动词原形。
* 情态动词基本上没有人称和数的变化, 但有些情态动词, 如can, will，may等有一般现在时和一般过去时，be able to有不同的时态变化。
情感
态度
情态动词的语法特征
* 情态动词的过去式并不一定表示过去时间，可以表示一种委婉、礼貌的语气。
e.g ①Could I use your dictionary
②Would you please do me a favor
③The young should care for the old.
常见的
情态动词
may/might
can/could
must
will/would
shall/should
have to
need
used to
dare
ought to
be able to
Activity 1 What do they mean
Activity 2
dare not – be afraid to do sth.
needn’t – not be necessary to do sth.
have to – be necessary to do sth.
be able to – have the ability to do sth.
aren’t able to – don’t have the
ability to do sth.
had better – give advice to do sth.
e.g①The man can/could speak two foreign
languages.
②Yesterday I was able to get home before the
heavy rain.
can/could VS be able to
* can/could表示习惯具备的能力，而be able to通常表示通过努力达成的一次性能力； can/could 主要是一般现在、一般过去时，而be able to有
较为丰富的时态变化。
must VS have to
e.g①As a Chinese, we must build our country
well and mustn’t forget our duty.
②The poor boy had to face the trouble bravely.
③-Must he finish the job today
- Yes, . -No, .
he must
he needn’t/
doesn’t have to
* must表示主观上“必须”,而have to通常表示出于客观原因“不得不”; must无时态变化,而have to有时态变化;mustn’t“禁止/不许”,needn’t“不必”。
During the holidays, I didn’t have to get up early.
But now it’s time to learn at school, so I have to get
up early every day. To be honest, I was much inspired
when I watched the Peking Winter Olympic Games.
I’m determined to study hard, so I think I must get
up early and mustn’t waste any time. I’m sure I
will be able to realize my e on!
Activity 3 Translate the following passage.
had better
Activity 4 Translate the following sentences.
你最好不要一下子做所有的事情，
最好是一件一件地做。
.
.
You’d better not do all the things at a time
You’d better do them one by one
need VS dare
既可用为情态动词，又可用作实意动词。
“需要”
“敢(于)”
Activity 4 Translate the sentences in two ways.
1. 苏翊鸣敢于挑战自己。
.
2. 朱易还需要再磨练一下。(steel oneself)
.
Su Yiming dares to challenge/dare challenge himself.
Zhu Yi still needs to steel/need steel herself.
1. Su Yiming dares to challenge/dare challenge himself.
.
.
Activity 5 Change the sentences into negatives.
2. Zhu Yi still needs to steel/need steel herself.
.
.
Su Yiming doesn’t dare to challenge himself
Su Yiming dare not challenge himself
Zhu Yi still doesn’t need to steel herself.
Zhu Yi still need not steel herself.
* need/dare作情态动词用时无人称和数的变化，
但是作为实意动词用时有人称和数的变化。
– Need you have lessons every day
– Yes, .
No, .
Activity 6 Answer the question.
we must
we needn’t
“必须”
“不必”
Activity 7
While going on your first trip to the UK is exciting, new and different customs can also be confusing. Table manners are no excep-tion. But don’t worry-here are some tips.
Activity 7
*You wait until everyone else has been served before you start eating.
*Sometimes there are so many knives and forks that you pick them up in case you get it wrong. The trick is to start on the one outside.
have to
dare not
*When you finish your meal, you —————
place your knife and fork on your plate with the handles at the four o’clock position.
had better
*Table manners, however, can differ in different situations. For example, you ———-
use a knife and fork when eating a hamburger or pizza. Just remember, when in Rome, do as the Romans do, and you will enjoy the local cuisine!
don’t have to
be able to
needn’t/
Summary
dare not –
needn’t –
have to –
be able to –
not be able to –
had better –
be afraid to do sth.
not be necessary to do sth.
be necessary to do sth.
have the ability to do sth.
don’t have the ability to do sth.
give advice to do sth.
Thank you!