All JLPT grammar
N1

Verbる べからず

Expresses the idea of 'must not do' or 'should not do'.

At a glance

~べからず means "must not" or "do not". It is a stiff, old-fashioned written form used for strong prohibitions on signs, notices, rules and set sayings.

Verb (dictionary form) + べからず

芝生しばふに入はいるべからず。 Keep off the grass.


How to form it

べからず attaches to the dictionary form of a verb. In modern Japanese it is used with verbs.

Verb type Rule Example
う-verb dictionary form + べからず 入はいる → 入はいるべからず
る-verb dictionary form + べからず 捨すてる → 捨すてるべからず
する-verb するべからず or すべからず 落書らくがきする → 落書らくがきするべからず / 落書らくがきすべからず

It is written language and usually ends the sentence. Before a noun it becomes べからざる.

Examples

  • 嘘うそをつくべからず。

    One must not tell lies.

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The rest of the lesson

When to use it, common mistakes, nuances and a quick check, with spaced repetition to make it stick.

Read the full lesson for free