Japanese Conditionals Explained: To, Ba, Tara and Nara
Japanese has four common ways to say “if”: と (to), ば (ba), たら (tara) and なら (nara). As a rule of thumb, use と for things that always happen, ば when you focus on the condition itself, たら for one-off “if” or “when” situations, and なら when you respond to something someone has just said. If you only learn one, learn たら: it works in the widest range of everyday sentences and is rarely wrong in conversation.
The four conditionals at a glance
| Form | Main use | Example |
|---|---|---|
| と | Natural, automatic results: whenever A happens, B follows | ボタンを押すと、ドアが開きます。 If you press the button, the door opens. |
| ば | The condition that must be met for B; general rules and advice | 毎日練習すれば、上手になります。 If you practise every day, you’ll improve. |
| たら | A specific “if” or “when”; B happens after A | 駅に着いたら、電話してください。 When you get to the station, please call me. |
| なら | “If that’s the case”: reacting to a topic or plan | 京都に行くなら、早く予約したほうがいいですよ。 If you’re going to Kyoto, you should book early. |
How to make each form
- と: plain present form + と. 行く → 行くと, 高い → 高いと.
- ば: change the final u sound to e and add ba. 行く → 行けば, 食べる → 食べれば, する → すれば. For i-adjectives, 高い → 高ければ.
- たら: plain past form + ra. 行った → 行ったら, 高かった → 高かったら, 雨だった → 雨だったら. If you know the past tense, you already know this one.
- なら: plain form or noun + なら. 行くなら, 学生なら.
If the plain past is still shaky, our guide to Japanese verb conjugation basics covers it step by step.
The differences that trip learners up
- Requests and invitations after と. You can’t end a と sentence with “please” or “let’s”. Say 家に帰ったら、連絡してね, not 家に帰ると、連絡してね.
- Order of events with なら. With なら, the second part can happen first. 日本に行くなら、円を買っておこう means “If you’re going to Japan, buy some yen (before you go)”. With たら, the order flips: 日本に行ったら means after you arrive.
- Discoveries with たら and と. In the past tense, both can mean “when I did A, I found B”: 窓を開けたら、雪が降っていた (When I opened the window, it was snowing).
- Advice with ば. 〜ばいい and 〜たらいい both mean “you should”, as in どうすればいいですか (What should I do?). These are worth learning as set phrases.
How to practise conditionals
Conditionals stick when you use them about your own life. Write five sentences for each form: what happens when you’re tired (と), what you need to pass your next test (ば), what you’ll do when you get home (たら), and advice for a friend’s plans (なら). Then say them out loud. Conditionals also appear in JLPT N4 and N3 grammar questions, so see our JLPT grammar tips if you’re preparing for the exam.
Practising with a tutor
Textbook rules only go so far, because native speakers choose between these forms by feel. In online lessons, a native tutor can give you real situations to react to, correct the form you pick, and explain why another one sounds more natural. A few focused sessions usually clear up the confusion that months of self-study leave behind.