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JLPT N3Modal Expressions

～ねばならない— Must (Literary)

A formal, literary way to say 'must' or 'have to', equivalent to なければならない. It expresses obligation or necessity and carries a weighty, written or old-fashioned tone. You will meet it in essays, editorials, formal speeches, and literature more than in casual talk.

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Pro lessonUNIT 118 · MODAL EXPRESSIONS

Structure · 形

[Verb ない-form (drop ない)] + ねばならない ; する → せねばならない

Examples · 例文

  • 我々は環境を守らねばならない。

    Wareware wa kankyou o mamoraneba naranai.

    We must protect the environment.

    守る → 守ら + ねばならない; formal 'must' in an editorial-style statement.

  • 約束は守らねばならないものだ。

    Yakusoku wa mamoraneba naranai mono da.

    A promise is something that must be kept.

    ねばならない states a general moral obligation in a literary tone.

  • この問題について真剣に考えねばならない。

    Kono mondai ni tsuite shinken ni kangaeneba naranai.

    We must think seriously about this problem.

    考える → 考え + ねばならない, expressing solemn necessity.

Usage notes · 注意

  • Register: formal/literary/written; everyday speech uses なければならない or なきゃ.
  • Irregular: する becomes せねばならない, not しねばならない.
  • Can end as ～ねばならぬ for an even more archaic/literary flavor.
  • Often signals moral duty or strong social obligation.

Commonly confused with

The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ～ねばならない is tested against.

vsなければならない

Same meaning ('must'), but なければならない is the standard neutral form; ねばならない is more formal, literary, and old-fashioned.

vsべきだ

べきだ expresses 'should/ought to' as the speaker's opinion or advice; ねばならない expresses an unavoidable necessity or obligation.

More modal expressions

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