The Grammar of Chinese Legal Obligations: 应当, 必须, 可以, 不得

Scope note: This article is about language literacy. It is not legal advice, and it should not be used to interpret legal rights or duties in a real case without qualified legal help.

Why legal Chinese cannot be read like ordinary advice

Words such as 应当, 必须, 可以, and 不得 look deceptively easy. A learner may translate them as “should,” “must,” “can,” and “cannot.” That is a starting point, not an interpretation. In legal and regulatory Chinese, these words help create obligations, permissions, powers, prohibitions, and procedures. The practical force depends on the actor, condition, document type, and consequence.

Compare:

• 用人单位应当依法缴纳社会保险。
• 经营者必须保证安全。
• 主管部门可以责令整改。
• 当事人不得隐瞒事实。

These are not casual suggestions. They are institutional statements assigning duties, powers, or prohibitions.

Four core modal markers

The English translation depends on legal drafting conventions. The important reading skill is not choosing one English word; it is identifying the legal function.

应当: formal duty

应当 often assigns a duty to a person, organization, or administrative body.

• 用人单位应当依法缴纳社会保险。 The employer has a formal duty to pay social insurance according to law.

• 当事人应当如实陈述事实。 The party should / shall truthfully state the facts.

• 有关部门应当及时处理。 The relevant department should / shall handle it promptly.

Compared with everyday 应该, 应当 is more formal and more document-like. It does not merely express personal advice. In legal or regulatory text, it often helps establish normative duty.

必须: strong necessity

必须 marks strong necessity. It can appear in law, regulations, safety notices, contracts, and instructions.

• 经营者必须保证商品和服务安全。
• 申请材料必须真实、完整。
• 进入施工现场必须佩戴安全帽。

It is often more direct than 应当. However, readers should avoid simplistic ranking. In some legal contexts, 应当 can be fully obligatory. The difference is partly convention, register, and drafting style.

可以: permission, authorization, or discretionary power

可以 in legal Chinese is not always ordinary “can.” It often grants permission or authority.

• 消费者可以要求赔偿。 The consumer may request compensation.

• 主管部门可以责令整改。 The competent authority may order correction.

• 当事人可以委托代理人。 The party may appoint an agent.

The subject matters. If the subject is a citizen or consumer, 可以 may express a right or permitted action. If the subject is an agency, it may express administrative power.

不得: prohibition

不得 is a formal negative obligation: must not, shall not, may not.

• 当事人不得隐瞒事实。
• 任何单位和个人不得非法收集个人信息。
• 未经许可，不得进入。

In public signs, 不得 sounds more formal than 不要 and less conversational than 别. It is common in rules, regulations, notices, contracts, and official instructions.

Related terms

The legal-reading grid

When reading a sentence, do not stop at the modal. Build a grid.

For 主管部门可以责令整改:

Learner traps

1. Translating 应当 as weak advice. In legal text, it can carry real duty.
2. Reading 可以 as physical ability. It often means legal permission or authority.
3. Treating 不得 as 没有. 不得 prohibits an action; 没有 says something did not happen or does not exist.
4. Ignoring institutional subjects. 主管部门, 经营者, 用人单位, 当事人, 消费者 all define role and responsibility.
5. Missing conditions and exceptions. Legal obligations often depend on clauses before or after the modal sentence.

Practice: label the force

Label each as duty, strong necessity, permission/power, or prohibition.

1. 经营者必须保证安全。
2. 当事人不得隐瞒事实。
3. 消费者有权要求赔偿。
4. 主管部门可以责令整改。
5. 用人单位应当依法缴纳社会保险。
6. 未经许可，不得转载。

Build an obligation sentence microscope. Users identify actor, modal marker, action, condition, exception, and consequence. The tool should output a non-legal explanatory label: “formal duty,” “strong requirement,” “authorization,” “prohibition,” or “right.” Include a warning that actual legal interpretation depends on jurisdiction and full document context.

Expanded quality pass additions

Legal-force caution. This article should be unusually careful. It is a literacy article, not legal advice. Words like 应当, 必须, 可以, 不得 have tendencies, but their real force depends on the statute, jurisdiction, article structure, definitions, exceptions, and enforcement mechanism. The safest learner skill is to map the sentence, not to overtranslate one modal word.

Reader workflow. For every regulatory sentence, mark five fields: actor, action, modal force, condition, and consequence. In 主管部门可以责令整改, the actor is 主管部门, the authorization is 可以, the action is 责令整改, and the consequence depends on surrounding provisions.

Article expansion target. Add a boxed warning: “Do not use this article to determine legal rights. Use it to read legal Chinese more accurately before consulting the actual law or a qualified professional.”

Remediation and upgrade pass additions

Legal modal verbs require a stronger warning

The article should state plainly that legal Chinese is not ordinary advice Chinese. 应当, 必须, 可以, and 不得 are not just “should,” “must,” “can,” and “cannot.” In legal or regulatory writing, they help define duties, permissions, powers, and prohibitions. A learner should read them as legal-force signals, not conversational mood words.

Add actor-condition-consequence grid

Every legal example should be parsed with the same grid:

This grid keeps readers from translating a modal and moving on.

Remediation for 可以

可以 is especially dangerous because learners hear “can” and assume ability. In legal writing, 可以 often authorizes an institution or party to do something. Compare:

他可以游泳。                 ability/permission in ordinary context
主管部门可以责令整改。       institutional authority, not swimming-type ability
消费者可以要求赔偿。         right/permission to claim compensation

Editorial safeguard