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JLPT N2 Grammar

てはならない

N2禁止

N2 · 禁止 · te-form verb + はならない

must not; should not

te-form verb + はならない

Expresses prohibition based on rules, ethics, or a strong judgment.

Formal in tone and common in rules, notices, explanations, and serious warnings.

試験中は、辞書やスマートフォンを使用してはならない。

During the exam, dictionaries and smartphones must not be used.

In casual situations, してはいけない is more natural; てはならない is more formal and stronger.

It sounds like a red line in a rulebook.

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