ばいい

JLPT Level: N3
Meanings

It would be good if you do X

You should do X

It's enough to do X

Usage

Verb (dictionary form) + ばいい

い-adjective (dictionary form) + ければいい

Noun + ならいい / ならばいい

Explanation
ばいい is a casual, advisory expression used to suggest a simple, practical course of action. It softens advice and avoids strong imperatives. It’s common in everyday conversation among friends, family, or peers. The verb stays in its dictionary form when giving direct action advice; for adjectives, you use the provisional form ければ; for nouns, ならいい or ならばいい expresses “that would be fine.” It’s not used for strong obligations or rules; instead it implies a gentle suggestion or a practical option that would be satisfactory.
行けばいい。
いけばいい。

You should go. / It would be fine if you go.

早く寝ればいい。
はやくねればいい。

You'd better sleep early.

食べればいい。
たべればいい。

Just eat (it); that would be fine.

寒ければコートを着ればいい。
さむければコートをきればいい。

If you're cold, you should put on a coat.

借りればいい。
かりればいい。

You should borrow (it).

時間があれば、公園へ行けばいい。
じかんがあれば、こうえんへいけばいい。

If you have time, going to the park would be nice.