Meaning & usage
The pattern repeats the same noun as Noun が Noun なら to say if someone truly lives up to that role, a certain behavior is expected, as in 先生が先生なら. It is used to criticize or demand proper conduct, often with should, must, or a negative consequence. The paired form AがAならBもB, as in 親が親なら子も子, condemns both sides as equally bad or unworthy.
Example sentences 5
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先生が先生なら生徒を見捨てない。
If you're truly a teacher, you wouldn't abandon your students.
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医者が医者なら患者を第一に考える。
If you're truly a doctor, you'll put your patients first.
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リーダーがリーダーなら責任を取るべきだ。
If you're truly a leader, you should take responsibility.
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大人が大人なら約束を守るはずだ。
If you're truly an adult, you'll keep your promises.
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友達が友達なら困った時に助けてくれる。
If they're truly your friends, they'll help you when you're in trouble.