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泣けば

if (someone) cries

→ 泣く
泣け to cry, to weep + ば Conditional (“if”)
verb Rare #37,413
if (someone) cries Often used with いい to mean “should” or “can just” cry.
JA: 泣けば気持ちが楽になるよ。
EN: If you cry, you’ll feel better.
Conjugation of 泣く
Conditional
泣け泣けば

悲しい時には泣けばいい。

When you're sad, it's okay to cry.

つらいときは泣きたいだけ泣けばいいと思うよ。

I think you should cry as much as you need to when you're having a hard time.

泣きたいなら思いっきり泣けばいいじゃん。

If you want to cry, then just cry your heart out.

泣きたい時には泣けばいいんだよ。

When you feel like crying, you should just cry.