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enseUnit2 Home ,Sweet Home
情态动词can/could用法总结
用法 说明 例句
表示能力 can表示现在的能力
could表示过去的能力 I can cook dinner for my family.
When I was five, I couldn't wash dishes.
表示请求 can用于非正式场合
could更礼貌委婉 Can I watch TV after dinner
Could you please help me clean my room
表示许可 can给予许可
could请求许可 You can play games after homework.
Could I invite friends to our house
表示可能性 can表示现实可能性
could表示较小可能性 We can decorate the living room together.
It could rain tomorrow, so take an umbrella.
表示建议 could用于提出建议
(比can更委婉) You could organize your bookshelf.
We could have a family movie night.
特殊用法与注意事项
句型 否定形式 can → can't/cannot; could → couldn't/could not
疑问形式 Can/Could + 主语 + 动词原形...
回答方式 肯定回答：Yes, ... can/could; 否定回答：No, ... can't/couldn't
时态区别 could可表示过去能力，但不用于表示过去具体某次动作的成功完成 I could finish my homework yesterday. → 应改为：I was able to finish...
注意事项 感官动词搭配：can/could与see/hear/smell等连用表示感知
I can hear my mother cooking in the kitchen.
情态动词can/could配套练习
班级：___________ 姓名：___________ 学号：___________
一、选择题（40分）
1. — ______ you help me with the housework
— Of course I can.
A. Can B. Could C. Will D. Should
2. When I was young, I ______ play the piano, but now I can't.
A. can B. could C. may D. might
3. — ______ I borrow your umbrella It's raining.
— Sure, here you are.
A. Can B. Must C. Should D. Would
4. You ______ ask your brother to clean his room. It's too messy.
A. can B. could C. should D. would
5. My sister ______ drive a car because she is only 15 years old.
A. can B. can't C. could D. couldn't
6. — ______ you pass me the salt, please
— Certainly.
A. Can B. Could C. May D. Must
7. She said that she ______ come to the family dinner, but she wasn't sure.
A. can B. could C. may D. might
8. My grandmother ______ cook delicious meals when she was young.
A. can B. could C. may D. might
二、用can, could, can't, couldn't的适当形式填空（20分）
1. I ______ swim when I was five, but now I swim very well.
2. ______ you please open the window It's too hot.
3. My little brother ______ tie his shoes because he is only four.
4. He ______ speak three languages when he was ten.
5. The baby ______ walk yet. She is only 10 months old.
三、句型变换（40分）
1. I can play the piano. (改为一般疑问句)
______ you ______ the piano
2. Could you help me (改为同义句，用can)
______ you ______ me
3. She could swim when she was five. (改为否定句)
She ______ ______ when she was five.
4.We could not find the way home. (改为同义句)
We ______ ______ to find the way home.
5. They can clean the room. (对划线部分提问) [划线部分：clean the room]
______ ______ they ______
情态动词can/could练习答案
选择题
1. A. Can
2. B. could
3. A. Can
4. B. could
5. B. can't
6. B. Could
7. B. could
8. B. could
二、适当形式填空
1. couldn't
2. Could
3. can't
4. could
5. can't
三、句型变换
1. Can; play
2. Can; help
3. couldn't swim
4. were unable (或 weren't able)
5. What can; do

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