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(共29张PPT)
Can / Could for polite requests and permission
2025-2026学年人教版八年级英语上册PPT★★★Unit 2
能够归纳并总结情态动词can和could用于礼貌地提出请求和征询许可的结构特征、功能及用法。
能够根据实际情况运用have to、need to等表达，得体地对请求或许可征询问题给出回应。
能够在真实语境中灵活运用can和could礼貌地提出请求和征询许可。
until
prep. 到……时；直到……为止
until用于肯定句中时，作介词，表示句子的动作一直持续到until短语所表示的时间为止。
She stayed in bed until lunchtime.
dead
adj. 不运行的；死的
My phone is dead.
我的手机死机啦。
note
n. 笔记；记录；便条
v. 注意；指出
take notes 做笔记
The teacher asked us to note the new words in the text.
老师让我们注意课文中的新单词。
rubbish
n. 垃圾
rubbish bins 垃圾桶
throw rubbish 扔垃圾
pick up rubbish 捡起垃圾
读下面的句子，归纳情态动词can/could的用法。
Can you speak English
你会说英语吗？
能力
2. A: Can I put some flowers on the table
我能在桌上摆些花吗？
B: Yes, of course you can.
可以，当然可以。
3. Can you help me hang up the photos
你能帮我把这些照片挂起来吗？
请求允许
提出请求
表示许可
1.表示能力（Ability）
can 表示现在或将来的能力。
e.g. I can help you tomorrow.
我明天可以帮你。
2. 表示请求（Requests）
can（非正式）和 could（更礼貌）用于请求许可或帮助。
e.g. Can you open the window （非正式）
Could you please pass me the salt （更礼貌）
3.表示许可（Permission）
can（非正式）和 could（更正式/委婉）用于请求或给予许可。
e.g. You can leave early today.（允许）
今天你可以早点走。
4. 表示建议（Suggestions）
e.g. We could go to the cinema tonight.
我们今晚可以去看电影。
Read the questions with can or could. Notice how they are answered. Then write R for requests or P for permission next to each question.
Could you please sweep the floor Yes, Dad. I’ll do it at once.
Could I hang out with my friends after lunch Sorry, Jim, but you have to pack up your things first.
Can I put some flowers on the table Yes, good idea!
Can you help me hang up the photos Sure. / No problem!
1. 看句子开头
如果是 Can/Could you... → 通常是请求R（请别人做某事）
如果是 Can/Could I... → 通常是许可P（询问自己是否能做某事）
2. 看回答内容
如果回答是Yes, I will. / Sure! → 通常是请求R
如果回答是允许/禁止某个行为Yes, you can. / No, you can’t. → 通常是许可P
Could you please sweep the floor Yes, Dad. I’ll do it at once.
Could I hang out with my friends after lunch Sorry, Jim, but you have to pack up your things first.
Can I put some flowers on the table Yes, good idea!
Can you help me hang up the photos Sure. / No problem!
R
P
R
P
情态动词can和could都可用于表示能力、提出请求和许可等。
用法 can（现在/未来） could（过去/委婉）
能力 She can swim. She could swim as a child.
请求 Can you help Could you help （更礼貌）
许可 Can I go Could I go （更正式）
Choose the best question to complete each conversation.
A: ______________
B: Of course you can.
2. A:____________________
B:Yes, if you are careful with it.
C
D
3. A:________________
B: No, you can’t. You
have a basketball game
tomorrow, remember
You need a good rest.
4. A: Can I go to the movies
B: Of course.
A: ___________________
B: I can’t. I have to do
some work now.
B
A
Make up conversations for each setting, using can or could.
1. You’re at your friend’s home. You want to call your parents, but your phone is dead.
A: Can / Could I use your phone
B: Sure. / Of course.
2. You were sick at home yesterday. Your friend went to
an English class and took notes. You want to know
more about the class.
A: Can I borrow your notes from English class
B: Sure. Here you are.
3. You are holding a large box. It is difficult to open the
door. Your neighbour comes.
A: Excuse me, could you please open the door for me
B: Of course! There you go!
4. You and your classmates want to help clean up the
community. Ask your classmates to bring gloves
and rubbish bags.
A: Can everyone bring gloves to help clean up the
community, please
B: Sure!
A: Sarah, could you please bring some rubbish bags
C: No problem! How many do you need
A: 20, I think.
C: OK.
Can I stay out until eleven
until prep.& conj. 到……时；直到……为止
e.g. They worked until 5 p.m. yesterday.
We danced and danced until a lot of them joined in.
not ... until ... 直到……才……
e.g. I didn’t see Uncle Wang until the evening.
Don’t move until I tell you.
【语境应用】将下列句子翻译成英语。
1) 我们必须等到晚上7点。
_______________________________
2) 直到雨停了我们才可以出去。
_________________________________
We must wait until 7 p.m.
We can’t go out until the rain stops.
I. 单项选择。
— ______ I borrow your pen
— Sure, here you are.
A. Should B. Can C. Must
2. — I forgot to bring my dictionary. Could I use yours
— Yes, you _______.
A. can B. must C should
3. — ______ I use your phone to make a call
— Sorry, it’s out of battery.
A. Would B. Must C. Could
B
C
A
Ⅱ. 改写句子。用 can/could将直接请求改为更礼貌的形式。
Give me your book. →
2. Let me use your computer. →
3. Tell me the time. →
4. Open the window. →
5. Pass me the salt. →
Could you give me your book
Can I use your computer
Could you tell me the time
Could you open the window
Can you pass me the salt
Ⅲ. 填空练习。（用 can/could 补全句子）
When I was five, I ______ swim, but now I ______ swim very well.
2. ______ you ride a bike when you were seven
3. I ______ see the mountains from my window when
the weather is clear.
4. Visitors _____ not smoke in the museum.
could
Could
can
can
can
IV. 判断正误。
1. Can you helping me →
2. Could I have some water →
3. Can I to go now →
4. Could you pass me the keys →
5. Can he cooks dinner →
(正确：Can you help me )

(正确：Can I go now )

(正确：Can he cook dinner )
1. 请求许可
could 更礼貌（如 Could I borrow your book ）
can 更直接（如 Can I use your phone ）
2. 规则/能力
用 can（如 You can’t smoke here.）
3. 回答许可
肯定回答：Yes, you can. / Sure./ Of course. / No problem.
否定回答：Sorry, you can’t / couldn’t.
I can
归纳并总结情态动词can和could用于礼貌地提出请求和征询许可的结构特征、功能及用法。
根据实际情况运用have to、need to等表达，得体地对请求或许可征询问题给出回应。
在真实语境中灵活运用can和could礼貌地提出请求和征询许可。
总结情态动词can/could表示请求和许可的构成形式、表意功能和用法。
预习Section B的生词并读课文。

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