N1 Grammar ⑥　べき

べき / べからず / べく — ought to / must not / in order to (literary)

'Students ought to study.' 'No entry.' 'Striving toward the goal.' — べき is the N1 literary form of moral obligation and prohibition.

What you'll learn

• べき（だ）: 'should / ought to' — moral or normative obligation
• べからず: 'must not / prohibited' — formal written prohibition, on signs
• べく: 'in order to' — literary purpose expression (V-dictionary + べく)
• Connection: V-dictionary + べき; する → するべき or すべき (both OK)

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