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乗れば

if (you) get on, if (you) ride

→ 乗る
乗れ E-row stem (used for potential and conditional forms) + ば conditional
verb · informal Rare #41,249
if (you) get on, if (you) ride The conditional form of 乗る; the subject depends on context.
JA: この電車に乗れば、駅まで行けます。
EN: If you get on this train, you can get to the station.
Conjugation of 乗る
Conditional
乗れ乗れば

どのホームで乗ればいいですか。

Which platform should I board from?

どのゲートから乗ればよいのでしょうか。

Which gate should I board from?

乗れば分かるよ

You'll understand once you ride it.

— High and Low (1963)

“乗れば分かるよ”が…

“You’ll understand once you ride it”...

— High and Low (1963)