ば

The ば conditional form expresses "if" or "if… then" in Japanese. It presents a condition under which a certain result naturally follows. It is used for general truths, hypothetical situations, and logical consequences.

Formation

Verbs (五段 / Godan): Change the final う-row kana to the corresponding え-row kana and add ば.

• いく行く → 行けば - のむ飲む → 飲めば - はなす話す → 話せば - かう買う → 買えば

Verbs (一段 / Ichidan): Remove る and add れば.

• たべる食べる → 食べれば - みる見る → 見れば

Irregular verbs:

• する → すれば - くる来る → 来れば（くれば）

い-adjectives: Remove い and add ければ.

• やすい安い → 安ければ - おいしい → おいしければ

な-adjectives / Nouns: + であれば (or ならば).

• しずか静か → 静かであれば - がくせい学生 → 学生であれば

Negative:ない → なければ

• 行かない → 行かなければ - 食べない → 食べなければ

General truths and logical consequences

ば is well-suited for expressing things that are generally or always true – if one condition holds, the result naturally follows.

This makes ば common in proverbs and advice:

Hypothetical conditions

ば can express hypothetical or counterfactual situations – things that haven't happened or may not happen.

～ば～ほど (the more… the more…)

A common pattern using ば is ～ば～ほど, which means "the more… the more…":

～ばいい – should / all you have to do

The pattern ～ばいい is used to give advice or suggest a simple solution:

Important restrictions

Unlike たら, the ば conditional generally cannot be followed by commands, requests, or volitional expressions in the main clause when the subject of both clauses is different. It works best when the result is a natural consequence rather than a deliberate action.

✗ 雨が降れば、傘を持っていってください。(Unnatural) ✓ 雨が降ったら、傘を持っていってください。

However, when the ば clause and the main clause share the same subject, or when using set patterns like ～ばいい or ～ば～ほど, this restriction does not apply.