なければならない also: なければなりません · なければいけない · なければいけません · ねばならない · ねばならぬ · ねばなりません · なければならぬ · なけばならない
Related words· 10 なくてはいけない expresses the same obligation as なければならない but sounds more colloquial and is common in spoken Japanese.
ないといけない is a casual, everyday way to express obligation, while なければならない is more formal and suitable for writing.
べき expresses a moral or logical 'should', while なければならない expresses a stronger, more absolute necessity or obligation.
なきゃいけない is a casual contraction of なければいけない , used in spoken conversation rather than writing or formal speech.
Show 6 more Show fewer なければならない is the general 'must/have to' pattern used after verbs and adjectives, while でなければならない is its copular form used after nouns and na-adjectives to state a required identity or condition.
なければいけません is more formal and emphatic than 無くてはいけません , both meaning 'must' or 'cannot do without', but the latter sounds a bit softer in speech.
なければならない is the standard grammatical form for obligation, while 無くてはならない (なくてはならない ) is a more emphatic or colloquial variant with the same meaning.
なければならない is the common everyday way to say 'must' in modern Japanese, whereas べし is formal/literary and rarely used in ordinary conversation.
なければならない expresses the same obligation as ないといけません but sounds more formal and is common in writing or official speech.
無くちゃいけない sounds casual and conversational, whereas なければならない is more formal and often used for rules, regulations, or written obligations.
Written forms なければなりません
Polite form; used in formal or polite contexts.
なければいけない
Slightly more colloquial than なければならない ; common in spoken Japanese.
Etymology Formed from the negative conditional なければ (from ない ) + ならない (negative of なる , 'to become'), literally 'if not do, it won't become', i.e., 'must do'. The ねば variant uses the classical conditional form of ぬ (negative).
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