The modal verb 可以: can, may
From the lesson “I'll have a cup of tea, please”
Structure
Subject + 可以 + Verb / 我可以……吗?
能愿动词“可以”位于动词前,表示可能、能够或许可。 可以 before a verb says something is possible or allowed: 你们可以看这本书 (You may read this book). To ask permission: 我可以坐吗? (May I sit?). Answer 可以 (yes) or 不可以 / 不行 (no).
Examples
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我可以再问您一个问题吗?
Wǒ kěyǐ zài wèn nín yí gè wèntí ma?
May I ask you one more question?
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你们可以看这本书。
Nǐmen kěyǐ kàn zhè běn shū.
You can read this book.
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我可以坐吗?——可以,请坐!
Wǒ kěyǐ zuò ma? — Kěyǐ, qǐng zuò!
May I sit? — Yes, please sit!