资源简介

(共21张PPT)
B2U1
Food for Thought
Look at the sentences from the reading passage. Pay attention to the words in bold.
01
I was able to hold a knife and fork—and chopsticks!
But there are still some dishes that Dad dare not try even after many years of marriage to my mother.
Mum and I just have to find a way to get him into the kitchen.
We’d better not eat too much roast food as it may make us suffer from heat inside our bodies.
“You needn’t try it if you don’t want to,” Mum said.
Modals
动词
Look at the sentences from the reading passage. Pay attention to the words in bold.
01
动词的分类
Look at the sentences from the reading passage. Pay attention to the words in bold.
01
情态动词之歌
情态动词的定义
01
情态动词_______独立作谓语，只能和_________一起构成谓语，没有数的变化，具有助动词功能。
不能
动词原形
我必须要多喝热水。I_____drink more hot water.
我能做到。
I_____do it.
禁止在这里吸烟。
You______smoke here.
他今天不需要工作。
He______work today.
我应该完成作业。
I_____do homework.
我可以进来吗？
_____I come in
must
can
mustn’t
needn’t
should
May
情态动词 (Modal verb)
情态动词 can may shall must will need dare
could might should / would / /
1. 部分情态动词有时态变化（一般现在时/一般过去时）；
2. 情态动词无人称数的变化，除be able to, have to以外；
be able to
had better
ought to
have to
情态动词的选择
01
情态动词can, could 能力 Nobody can stop the development of science.
请求建议 (用could语气更委婉，回答用原形) Could you please wait me a moment, Jenny
Yes, I can.
猜测 (用于否定句、疑问句或感叹句中) How can/could you be here
你怎么会在这儿？
She couldn't/can't be so stupid to do that.
她不可能蠢到去做那种事吧。
情态动词的选择
01
1. The man can/could speak two foreign languages.
2. Yesterday I was able to get home before the heavy rain.
can/could表示_________________，而be able to通常表示通过努力达成的_____________; 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。
习惯性具备的能力
一次性的能力
can/could与be able to的区别
01
情态动词may, might 请求或允许 (might语气较委婉) I wonder if I might ask you a favor
You may tell him this.
推测 (might可能性更小) That may/might not be true.
may放在句首，表示祝愿 May God bless you!
may/might well (很可能); may/might as well (不妨); You may well be right. 你很可能是对的。
It’s freezing cold outside. We may as well stay at home.
情态动词的选择
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肯定回答一般是：Yes, please./Certainly./ Sure等，
否定回答一般是：Please don't./No，you can't/mustn't.
can 和 may 的区别
can多用于疑问句和否定句，表示怀疑或不相信等态度；he can’t be right
may则多用于陈述句(肯定)，表示一种揣测。he may be right.
情态动词shall 用于第一人称时， 可表示征求对方意见，译为“要不要...”(通常为疑问句)； 或表示将要发生的事，译为“将要...”(通常为肯定句)。 Shall we begin our class
(表示征求意见)
I shall be in Shanghai this time next week.
(表示将来动作)
用于第二、三人称时, 表示命令规定(通常为肯定句)。译为“应该”。 You shall go to school on time.
情态动词的选择
01
情态动词should& ought to 义务或责任 We should/ought to learn from each other.
建议或劝告 You should/ought to try your best to better your performance.
推断 They should/ought to be there by now.
意外或惊讶，译为“竟然” It's strange that he should come so late.
情态动词的选择
01
情态动词must 必须(侧重主观) mustn’t 禁止 Must I do my homework now
You mustn't smoke here.
推断 译为“准是，一定是”(只用于肯定句)。若用于否定句或疑问句，则用can’t (一定不是)。 That can't be the only way. There must be other ways of solving the problem.
have to 客观上的需要，强调被迫性，有“不得不”的含义 Sorry, I have to leave now.
情态动词的选择
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肯定回答：yes, … must
否定回答：no, you needn’t/ no, you don’t have to
情态动词will, would 意愿 译为“愿意”。will指现在的意愿，would指过去的意愿。 I will read the letter for you, if you want.
He asked if I would show him the way.
委婉语气 译为“好吗？” would更加委婉。 Will/Would you please pass me the salt
Would you like a cup of tea
习惯或倾向 译为“一般，总会”。will表示现在，would表示过去。 He would always complain if he got the opportunity.
Wherever he goes, he will take an umbrella with him.
情态动词的选择
01
情态动词need 用作情态动词，表示“需要”(无时态与人称的变化)。 I need your help.
She need not any help. (否定时，直接在情态动词后+not)
need用作实义动词，通常为“need to do sth”结构或“need+n” (有时态与人称的变化)。need to be done=need V-ing Lily needs more money to pay for that book.
Lily needed more money to pay for that book at that time.
Lily doesn’t need any more money to pay for that book.
情态动词的选择
01
肯定回答：yes, … must
否定回答：no, you needn’t/ no, you don’t have to
通常用于否定句、疑问句和条件句
情态动词dare 作情态动词，译为“敢”，通常只用于否定句、疑问句以及if或whether之后，一般不用于肯定句。(无人称变化，有过去式dared) Dare you tell her the truth
I daren't ask her this question.
作实义动词，译为“敢于”，通常为“dare to do sth” (有人称与时态的变化） She dares to go alone.
She doesn’t dare to go alone.
She didn’t dare to go alone.
情态动词的选择
01
“情态动词＋have＋过去分词”表示对过去动作或状态的推测、假设
（1）must have done “过去一定做了某事”?
（2）can’t/couldn’t have done “过去不可能做了某事”?
（3）may/might have done “过去可能做了某事”?
（4）needn’t have done “过去本来没有必要做而做了某事”
（5）need have done “过去本需要做某事而实际未做” ??
（6）should/ought to have done “过去本来应该做某事而没有做”?
（7）shouldn’t/oughtn’t to have done “过去本来不应该做某事而做了”?
情态动词表推测
01
1. He is right.
2. He must be right.
3. He will be right.
4. He would be right.
5. He ought to be right.
6. He should be right.
7. He may be right.
8. He could be right.
9. He might be right.
certain
almost certain
uncertain
情态动词表推测
01
Modals Meanings Functions
be able to
dare
have to
had better
need
5
ability
courage
strong advice
advice
necessity
1
4
3
2
Match the modals to their meanings, and summarize their functions.
01
dare not
needn’t
have to
be able to
aren’t able to
had better
Read the introduction to an app, fill in the blanks with modals, and explain their functions.
01
Complete the tips for good table manners with the correct forms of modals
have to
dare not
had better
needn’t / don’t have to
be able to
感谢观赏
Food
for
Thought

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