くれればいいのに

I wish you would

→ 呉れる
phrase Uncommon #8,920
I wish you would Expresses a wish that someone would do something for the speaker. With よかったのに, it expresses regret that they didn’t do it.
JA: もっと早く教えてくれればいいのに。
EN: I wish you would tell me sooner.

僕に頼んでくれればいいのに

You could have just asked me.

— ネバーエンディング・ストーリー (1984)

グリンダが私たちが生きていることを知ってくれればいいのに。

I wish Glinda knew that we were alive.

— ウィキッド 永遠の約束 (2025)

彼らがけんかをやめてくれればいいのに。

I wish they would stop fighting.

トムが一緒にここにいてくれればいいのに。

I wish Tom were here with me.