～ば
provisional conditional “if”
～ば is the provisional conditional. It attaches to a verb or adjective's conditional stem and sets up a clean “if X, then Y”: 行けば = “if (you) go”, 高ければ = “if it is expensive”.
It shines in general truths and logical rules. Whenever the condition holds, the result follows.
1. Logical or general conditions
Use ～ば for rules, instructions, and cause-and-effect statements.
ボタンを押せば、ドアが開きます。
“If you press the button, the door opens.”
- ボタン = button
- を = object marker
- 押せば（おせば）= if (you) press
- ドア = door
- が = subject marker
- 開きます（あきます）= opens
2. Wishes and hindsight: ～ばいい / ～ばよかった
～ばいい means “it would be good if ...” (advice or a wish), and its past version ～ばよかった expresses regret: “I should have ...”.
もっと早く起きればよかった。
“I should have gotten up earlier.”
- もっと = more
- 早く（はやく）= early
- 起きれば（おきれば）= if (I) had gotten up
- よかった = it would have been good
～ば vs ～たら
～たら is the looser everyday conditional and also covers “when / after” (家に帰ったら = “when I got home”). ～ば suits general truths and logical if-then reasoning. Think of it as the “rulebook” conditional.
How to form it
Conditional stem (仮定形) + ば
- Godan (u-verbs): change the final u-sound to the e-row and add ば — 行く（いく）= to go → 行けば（いけば）= if (you) go; 飲む（のむ）= to drink → 飲めば（のめば）= if (you) drink
- Ichidan (ru-verbs): drop る and add れば — 食べる（たべる）= to eat → 食べれば（たべれば）= if (you) eat
- する = to do → すれば = if (you) do
- 来る（くる）= to come → 来れば（くれば）= if (he) comes
- i-adjectives: drop い and add ければ — 高い（たかい）= expensive → 高ければ（たかければ）= if it is expensive
- Negative: ない = not → なければ = if not
Key idea
～ば states a pure condition: whenever X holds, Y follows. If you could rephrase your sentence as a general rule like “press it and it opens”, ～ば is the natural choice.
Other N4 grammar
Updated .