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Unit 5语法：情态动词can
一、情态动词can的核心特点
can是情态动词，无人称和数的变化（无论主语是I/you/he/they，can都保持原形），且后必须接动词原形 。
二、核心用法1：表“能力”
1. 基本含义
描述主语（人/物）具备的技能、本领，翻译为“能、会”。
2. 句式结构
肯定句：主语 + can + 动词原形 + 其他
例：I can play the guitar.（我会弹吉他）
否定句：主语 + can’t（=can not） + 动词原形 + 其他
例：She can’t swim.（她不会游泳）
一般疑问句：Can + 主语 + 动词原形 + 其他？
回答：Yes, 主语 + can. / No, 主语 + can’t.
三、拓展用法2：表“请求许可”
1. 基本含义
向对方提出委婉的请求，翻译为“可以、能”，常用于口语/申请场景。
2. 句式结构
请求自己做某事：Can I/we + 动词原形 + 其他？
例：—Can I join the music club （我能加入音乐俱乐部吗？）
请求对方做某事：Can you + 动词原形 + 其他？
四、拓展用法3：表“可能性”
1. 基本含义
表示客观上的可能性，翻译为“可能、会”，常用于否定句/疑问句表“推测”。
2. 句式结构
否定句（表“绝对不可能”）：主语 + can’t + 动词原形 + 其他
例：He can’t be in the art club.（他不可能在美术俱乐部）
五、拓展用法4：表“提议/提供帮助”
1. 基本含义
主动向对方提供帮助，翻译为“可以、能”。
2. 句式结构
主动帮忙：I can + 动词原形 + 其他
例：I can help you make the club poster.（我可以帮你做俱乐部海报）
六、高频易错点总结
can后必须接动词原形；
can’t是can的否定形式；
can侧重“先天/当下能力”，be able to侧重“后天习得的能力”（七年级了解）。
专项习题
一、基础题：用can/can’t完成句子
My dad ______ drive a car, but he ______ ride a bike.
______ you speak Japanese I need help with the club’s international activity.
A rabbit ______ run fast, but it ______ fly.
______ I use the club’s computer to print the poster
It ______ snow tonight—let’s check the weather before the club trip.
We ______ finish the club’s decoration in an hour if we work together.
She ______ be in the library—her bag is still in the club room.
______ you pass me the glue I’m making the club’s notice board.
The baby ______ walk yet, but he ______ crawl.
I ______ play the drums, so I want to join the school band club.
______ your sister swim She can join the swimming club if she can.
Birds ______ fly, but dogs ______.
______ we eat snacks in the club room
He ______ be late—he left home an hour ago.
My mom ______ cook delicious food, but she ______ bake cakes.
______ you help me practice the club’s English dialogue
Fish ______ live without water—so we can’t take them out of the tank.
______ I borrow the club’s basketball for the weekend
They ______ speak French, so they can help with the club’s exchange activity.
The little girl ______ read, but she ______ write.
二、中档题：句型转换
He can play chess.（改为一般疑问句，表能力）
_________________________________________________________________
I can join the chess club.（改为否定句，表请求许可）
_________________________________________________________________
They can speak English.（改为否定句，表可能性）
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We can help with the club party.（改为一般疑问句，表提议）
_________________________________________________________________
She can sing well.（改为否定句，表能力）
_________________________________________________________________
The cat can climb the tree.（改为一般疑问句，表能力）
_________________________________________________________________
I can use your pen.（改为一般疑问句，表请求许可）
_________________________________________________________________
He can be at the club meeting.（改为否定句，表可能性）
_________________________________________________________________
Tom can play the piano.（改为一般疑问句并作肯定回答，表能力）
_________________________________________________________________
_________________________________________________________________
We can go to the club’s field trip.（改为否定句，表请求许可）
_________________________________________________________________
三、提高题：补全对话
对话1：加入体育俱乐部
A: Hi! I want to join the sports club.
B: Great! What sports ______ you play
A: I ______ play basketball and football. But I ______ play tennis.
B: That’s okay! ______ you come to the club’s training this afternoon
A: Yes, I can. ______ I bring my basketball
B: Of course you can. Also, ______ you help carry the sports equipment
A: Sure! I ______ do that easily.
B: Perfect! See you this afternoon.
A: See you!
对话2：咨询音乐俱乐部
A: Excuse me! I want to know about the music club.
B: Hi! What instruments ______ you play
A: I ______ play the guitar a little, but I ______ play the piano.
B: No problem! We have teachers to teach. ______ you come to the trial class tomorrow
A: Yes, I can. ______ I bring my own guitar
B: Yes, you can. And ______ you tell your friend about the club We need more members.
A: Sure! I ______ ask her tonight.
B: Thanks! See you tomorrow.
A: See you!
对话3：俱乐部活动准备
A: We need to prepare for the club’s open day.
B: What can we do
A: First, ______ you make some posters
B: Yes, I can. But I ______ draw well—can you help me
A: Of course! I ______ draw cartoons. Also, ______ Tom bring the sound equipment
B: I think he can. He ______ carry heavy things easily.
A: Great! ______ we ask the teacher for more supplies
B: Yes, we can. She ______ help us.
A: Perfect! Let’s start now.
习题答案
一、 基础题
1. can; can’t 2. Can 3. can; can’t 4. Can 5. can
6. can 7. can’t 8. Can 9. can’t; can 10. can
11. Can 12. can; can’t 13. Can 14. can’t 15. can; can’t
16. Can 17. can’t 18. Can 19. can 20. can; can’t
二、. 中档题
1. Can he play chess
2.I can’t join the chess club.
3.They can’t speak English.
4.Can we help with the club party
5.She can’t sing well.
6.Can the cat climb the tree
7.Can I use your pen
8.He can’t be at the club meeting.
9.—Can Tom play the piano —Yes, he can.
10.We can’t go to the club’s field trip.
三、 提高题
对话1
A: Hi! I want to join the sports club.
B: Great! What sports can you play
A: I can play basketball and football. But I can’t play tennis.
B: That’s okay! Can you come to the club’s training this afternoon
A: Yes, I can. Can I bring my basketball
B: Of course you can. Also, Can you help carry the sports equipment
A: Sure! I can do that easily.
B: Perfect! See you this afternoon.
A: See you!
对话2
A: Excuse me! I want to know about the music club.
B: Hi! What instruments can you play
A: I can play the guitar a little, but I can’t play the piano.
B: No problem! We have teachers to teach. Can you come to the trial class tomorrow
A: Yes, I can. Can I bring my own guitar
B: Yes, you can. And can you tell your friend about the club We need more members.
A: Sure! I can ask her tonight.
B: Thanks! See you tomorrow.
A: See you!
对话3
A: We need to prepare for the club’s open day.
B: What can we do
A: First, can you make some posters
B: Yes, I can. But I can’t draw well—can you help me
A: Of course! I can draw cartoons. Also, can Tom bring the sound equipment
B: I think he can. He can carry heavy things easily.
A: Great! can we ask the teacher for more supplies
B: Yes, we can. She can help us.
A: Perfect! Let’s start now.

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