# べきだ: should do; must do ~

> Learn how to use べきだ, a JLPT N3 Japanese grammar point meaning should do; must do, with structure, nuance, examples, mistakes, and comparisons.

JLPT level: N3 · Updated: 2026-05-17 · Canonical: https://hane-app.com/blog/n3-beki-da/

**べきだ** means **should do; must do; have a duty to ~**. It is a **JLPT N3** grammar pattern used to **state an obligation, strong recommendation, or moral duty**.

This grammar point often appears in **neutral to formal** Japanese. If you want to **state a strong moral or logical obligation**, **べきだ** is a useful pattern to learn.

## What does べきだ mean?

Use **べきだ** when you want to **state an obligation, strong recommendation, or moral duty**.

Natural translations include:
- should do; must do ~
- should do; must do; have a duty to ~
- should do; must do

## How to form べきだ

Verb dictionary form + べきだ (する → すべき / するべき)

Examples of the pattern:
- 行くべきだ
- 勉強するべきだ
- 注意すべきだ

## When is べきだ used?

Use **べきだ** in situations like:
- giving strong advice
- discussing social obligations
- stating principles or rules

Tone and register:
- neutral to formal
- Common in giving strong advice, test questions, and written narratives

## べきだ example sentences

- 自分の意見をはっきり言うべきだ。 — You should state your opinion clearly.
- 親の言うことを聞くべきだ。 — You should listen to what your parents say.
- 約束は守るべきだ。 — You should keep your promises.
- もっと早く家を出るべきだった。 — I should have left home earlier.
- 環境問題についてもっと考えるべきだ。 — We should think more about environmental issues.

## Nuance of べきだ

The key nuance is **carries a sense of moral or social obligation; heavier and more prescriptive than lighter suggestion patterns**.

This matters because **〜べきだ feels definitive. It comes across as principled advice rather than a gentle suggestion. It is often what you 'should' do based on social norms, ethics, or logic.**

For example:
- In giving strong advice, it sounds natural and specific.
- Compared with **[ばいい](/blog/n3-ba-ii/)**, it carries a different weight and implication.

## べきだ vs ばいい

Both **べきだ** and **[ばいい](/blog/n3-ba-ii/)** can express **should do**, but they are different.

**べきだ**:
- stronger; implies moral or social obligation; sounds more definitive and judgmental

**[ばいい](/blog/n3-ba-ii/)**:
- softer suggestion; implies it would be good if, without the weight of obligation

Quick contrast examples:
- もっと勉強するべきだ。 — You should study more (it's your duty).
- もっと勉強すればいい。 — You should study more (friendly suggestion).

## Common mistakes with べきだ

Watch out for these mistakes:
- Using するべきだ vs すべきだ — both are correct, but すべきだ is slightly more formal
- Using it for light suggestions where ばいい or たらいい is better
- Confusing with べきだった (should have done / past form)

## Is べきだ on the JLPT?

Yes. **べきだ** is commonly taught as **JLPT N3** grammar.

That means learners should be able to:
- recognize it in reading
- understand its nuance in context
- use it in simple original sentences

## Practice questions for べきだ

Try making your own sentences with these prompts:
- Say someone should keep their promises.
- Advise someone to state their opinion.
- Talk about what society should do.

## Learning path for べきだ

To learn **べきだ** efficiently, review simple must/cannot expressions first, then separate personal advice from social or practical pressure.

1. First, make sure you can form **べきだ** without looking at the pattern chart.
2. Next, compare it with [ばいい](/blog/n3-ba-ii/), [べきではない](/blog/n3-beki-dewa-nai/). These patterns are close enough that choosing between them helps you understand the nuance.
3. Finally, write situations involving work, promises, rules, or responsibility; then check whether replacing **べきだ** with [しかない](/blog/n3-shikanai/) changes the meaning.

## Related grammar to review next

- [ばいい](/blog/n3-ba-ii/) — because it is the closest comparison used in this article.
- [べきではない](/blog/n3-beki-dewa-nai/) — because it is another N3 pattern for duty, advice, or unavoidable action.
- [しかない](/blog/n3-shikanai/) — because it is another N3 pattern for duty, advice, or unavoidable action.
- [わけにはいかない](/blog/n3-wake-niwa-ikanai/) — because it is another N3 pattern for duty, advice, or unavoidable action.

## Learn べきだ with Hane

If you want to review **べきだ** together with the related patterns above, Hane helps you connect grammar, kanji, and vocabulary in short, focused sessions.

Browse more lessons here:
- [All grammar lessons](/blog/)
- [JLPT N3 grammar lessons](/blog/n3/)