Japanese Conditionals Complete Guide: と vs ば vs たら vs なら — N4-N3 Deep Comparison [JLPT N4]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
They all mean 'if' — but native speakers feel the difference every time. 20 contrastive pairs explained.
English has one “if”; Japanese has four: と・ば・たら・なら
“Press the button and it lights up,” “I should have done it sooner,” “Call me once you arrive,” “If you're going to Japan, I recommend Mt. Fuji” — those four meanings map to four different Japanese conditionals: と・ば・たら・なら. English gets by with one “if,” but Japanese splits by necessity, hypothesis, time order, and picking up the other person's topic. This guide lays out all four “ifs” — their feel and when to use each — so you stop guessing.
🧭 Pick the right conditional in one minute (decision guide)
Four ways to say “if” — follow this path:
- Will the follow-up be ‘will／command／request'? (〜てください・〜よう・〜たい) → と is not allowed; use たら (most versatile) or なら.
- Is it an ‘inevitable, natural result'? (press it and it opens; spring comes and flowers bloom) → use と.
- Stating a ‘hypothesis／advice,' or a proverb? → use ば.
- Responding ‘taking what the other person just said as the premise'? (if you're going…) → use なら.
When unsure, start with たら (widest range, follow-up almost unrestricted). Details, exceptions, and register below and in the comparison table.
Quick Selection Guide
| Situation | Use |
|---|---|
| Natural laws, instructions | と |
| Hypothetical suggestions | ば |
| Sequential (after doing A, then B) | たら |
| Responding to what someone said | なら |
| Regret (I should have...) | ば (〜ばよかった) |
① 〜と (Natural, Inevitable Result)
| Japanese | Reading | Meaning |
|---|---|---|
| 春になると、桜が咲きます。 | はるになると、さくらがさきます | When spring comes, the cherry blossoms bloom. |
| このボタンを押すと、ドアが開きます。 | このボタンをおすと、ドアがひらきます | Press this button and the door opens. |
| 右に曲がると、駅が見えます。 | みぎにまがると、えきがみえます | Turn right and you'll see the station. |
| 水は100度になると、沸騰します。 | みずは100どになると、ふっとうします | Water boils when it reaches 100°C. |
② 〜ば (Hypothetical Condition / Suggestion)
| Japanese | Meaning |
|---|---|
| 早く起きれば、間に合います。 | If you get up early, you'll make it in time. |
| 安ければ、買います。 | If it's cheap, I'll buy it. |
| 勉強すれば、合格できます。 | If you study, you can pass. |
| 彼に聞けば、わかるでしょう。 | If you ask him, you'll probably find out. |
| 春が来れば、また会えます。 | When spring comes, we can meet again. |
③ 〜たら (After Completion — the Most Versatile)
| Japanese | Meaning |
|---|---|
| 宿題が終わったら、遊んでいいよ。 | Once you finish your homework, you may go play. |
| 日本に着いたら、電話してください。 | Please call me when you arrive in Japan. |
| 春になったら、旅行しましょう。 | Let's travel when spring comes. |
| もし宝くじが当たったら、世界旅行をします。 | If I win the lottery, I'll travel the world. |
| 会ったら、何を話しますか？ | If you meet them, what will you say? |
④ 〜なら (Based on the Other Person's Premise)
| Japanese | Meaning |
|---|---|
| 日本に行くなら、富士山に登るといいですよ。 | If you're going to Japan, climbing Mt. Fuji is a great idea. |
| 彼女が来ないなら、私が行きます。 | If she's not coming, then I'll go. |
| 安いなら、買います。 | If it's really that cheap, I'll buy it. |
| それが本当なら、大変です。 | If that's true, this is serious. |
The Four Conditionals Compared
| と | ば | たら | なら | |
|---|---|---|---|---|
| Objective inevitability | ○ | △ | △ | ✗ |
| Hypothetical suggestion | ✗ | ○ | ○ | ○ |
| Time sequence | ✗ | ✗ | ○ | ✗ |
| Based on the other's info | ✗ | ✗ | ✗ | ○ |
| Can take command / volition | ✗ | ○ | ○ | ○ |
⚠️ Where learners slip up
① と can't be followed by a command／intention／request. ✗ 春になると旅行しよう. 「と」 means “necessity, every time” (a natural rule); only an objective result follows. For intention, use たら (春になったら旅行しよう).
② なら picks up the other person's topic (premise). 「日本に行くなら、京都がいい」 = if (you say) you're going to Japan, (I suggest) Kyoto. なら is “given what you said, here's my advice.”
③ When unsure, use たら. たら is the most versatile and colloquial — time order (once ~), hypothesis (if ~), and it even allows commands. When in doubt, たら is safest.
💡 The key point in use
Don't rote-learn the four “ifs” — grab each one's signature scene: と = press and it lights up (necessity, every time); ば = general hypothesis, proverbs (急がば回れ); たら = call me once you arrive (after completion, most versatile); なら = if you're going, I suggest… (picking up your topic). Battle rule: in speech, when unsure, always use たら (almost always right, and it allows commands); use と only for “necessity, every time”; use なら to respond to the other person. That puts all four in their places.
❓ Questions you might have
Q: Fastest way to pick と・ば・たら・なら?
By signature scene: necessity, every time → と (押すと開く); general hypothesis, proverbs → ば (安ければ買う); after completion, most versatile, allows commands → たら (着いたら電話して); picking up the other's topic, giving advice → なら (日本なら京都). When unsure, たら is safest.
Q: What most sets 「なら」 apart from the other three?
「なら」 takes what the other person (or prior context) said as its premise, then gives advice or a response — the order can even be “result first, condition after” (京都がいい、日本に行くなら). The other three (と・ば・たら) mostly follow a natural “condition → result” time order. なら is more “since you put it that way, then…”.
🖊️ Practice Quiz
Q1. 「このボタンを押す___、ドアが開きます。」(objective instruction) Fill the blank.
(A) と (B) ば (C) たら (D) なら
Q2. 「もっと早く勉強すれ___よかった。」(regret) Fill the blank.
(A) ば (B) た (C) て (D) と
Q3. 「日本に着い___、電話してください。」(call after arriving) Fill the blank.
(A) と (B) ば (C) たら (D) なら
Q4. 「日本に行く___、富士山に登るといいですよ。」(advice premised on the other going) Fill the blank.
(A) と (B) ば (C) たら (D) なら
Q5. Which 「と」 sentence is correct?
(A) 春になると、旅行してください。
(B) 春になると、桜が咲きます。
(C) 春になると、旅行したいです。
(D) 春になると、旅行しましょう。
Answer Key
1. (A) と ── objective inevitability (press the button → the door opens) uses と.
2. (A) ば ── 〜ばよかった = I wish I had … (regret).
3. (C) たら ── after a completed action (arriving), do another thing: 着いたら電話して.
4. (D) なら ── なら takes up the other's premise (if you're going): 行くなら…登るといい.
5. (B) 春になると、桜が咲きます ── と's latter takes no intention/command/request (✗ してください/したい/しましょう); a natural result is fine.