HSK 1 Modal Verb 可以 (kěyǐ): Permission, Possibility, and Polite Requests

What 可以 (kěyǐ) Means and Why It Matters

In the HSK 1 grammar syllabus, 可以 (kěyǐ) is classified under parts of speech as a modal verb, known in Chinese as 能愿动词 (néngyuàn dòngcí). Modal verbs do not describe standalone physical actions; instead, they stand in front of another verb to express the speaker's attitude, ability, permission, or situational possibility. Because English often uses the single word "can" for all of these ideas, learners must pay close attention to which type of "can" 可以 (kěyǐ) actually covers.

• Permission: Asking for or granting approval to do something ("may" or "be allowed to").
• Situational possibility: Stating that local conditions or rules allow an action to take place ("can" or "it is possible to").
• Polite suggestion: Recommending a helpful option to the listener without sounding bossy ("could" or "might want to").

Core Sentence Patterns

可以 precedes the associated action verb or verb phrase. Time expressions and other modifiers can also appear before the modal, so it need not immediately follow the subject. It does not conjugate for person or tense, and no English-style infinitive marker “to” is needed before the following action.

To ask for permission or check whether an option is available, the most common beginner pattern adds the question particle 吗 (ma) to the end of the statement. You can also answer such a question simply by saying 可以 (kěyǐ) on its own.

Three Everyday Uses of 可以 (kěyǐ)

First, use 可以 (kěyǐ) to ask for or give permission. In daily conversation, asking a question with 可以 (kěyǐ) is a polite, natural way to check if someone minds you doing something, or if an authority figure allows it.

Second, use 可以 (kěyǐ) when external circumstances make an action feasible. Here, you are not asking for personal permission; you are stating what a place, tool, or schedule allows.

Third, use 可以 (kěyǐ) with a second-person subject like 你 (nǐ) to offer a gentle suggestion. This tells the listener that a good option is open to them.

How to Negate: 不可以 (bù kěyǐ) vs. 不能 (bù néng)

For the ordinary negative permission pattern here, use 不可以. For practical inability, 不能 is often appropriate. This is not a rule that every modal must be negated with 不 in every construction: 没能 is used for not managing to do something in a particular event.

Both 不可以 and 不能 can state a prohibition. In a practical explanation such as “I cannot go today”, 不能 is often a natural choice. How firm or polite the sentence sounds also depends on its wording, delivery, and context, not just which modal is used.

Comparing Learned Skill with Feasibility

English “can” does not select one Chinese modal automatically. If your main point is having learned how to do something, 会 makes that focus clear. 可以 can still occur with the same action when capability, feasible conditions, or permission is the point.

• 可以 (kěyǐ): Focuses on permission, external allowance, or available options.
• 会 (huì): Focuses on acquired know-how and mastered skills.
• 能 (néng): Focuses on physical capability, efficiency, or whether circumstances permit an action.

The following two childhood statements are both possible. 可以游泳 says swimming was possible or allowed; 会游泳 more directly states knowing how to swim. Choose according to the intended meaning rather than labelling every 可以 + skill verb as wrong.

Note that in casual speech, 可以 (kěyǐ) can also appear alone as an adjective meaning "not bad" or "passable" (for example, saying a dish is quite good). However, within the HSK 1 verb category covered here, focus on mastering its role as a modal verb directly before an action verb.

Frequently asked questions