能/可以(néng / kěyǐ)
Can / May / Able To
Structure Pattern
Explanation
Both 能 (néng) and 可以 (kěyǐ) mean "can," but with subtle differences. 能 emphasizes ability or physical capacity. 可以 emphasizes permission or possibility. For negation, 不能 means "cannot" (ability), and 不可以 means "may not" (permission).
Example Sentences
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Wǒ néng shuō Zhōngwén.
I can speak Chinese.
Zhèlǐ kěyǐ xīyān ma?
Can you smoke here?
Nǐ bù néng jìnqù.
You can't go in.
Míngtiān wǒ kěyǐ bāng nǐ.
I can help you tomorrow.
Common Mistakes
Common Mistake
我可以游泳。
Correct Usage
我能游泳。
Using '可以' here implies 'I am allowed to swim' or 'It's possible for me to swim (e.g., the pool is open)'. To express the physical ability to swim, '能' is the correct choice.
Related Grammar Points
Master 能/可以
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