入れば

if you go in

→ 入る
入れ to enter; go inside + ば Conditional (“if”)
verb Rare #36,808
if you go in Conditional form of 入る, used for an action that may happen before what follows.
JA: 中に入れば、すぐ分かるよ。
EN: If you go inside, you'll understand right away.
Conjugation of 入る

洞窟まで奴ら一度入ればもう出られない

Once those guys enter the cave, they’ll never be able to get out.

— ロード・オブ・ザ・リング/王の帰還 (2003)

全然入れば?

Will it even fit?

— Hoje Eu Quero Voltar Sozinho (2014)

ワイン風呂に入れば立派な男になれるのよ

If you take a wine bath, you'll become a real man.

— 8 1/2 (1963)

と思う入ればいいんだな?

So I should think of it that way, right?

— ブゴニア (2025)