“〜to” (conditional): As Soon As 〜 — Natural Result, Discovery & Habit [JLPT N4]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
「春になると花が咲く」「押すと電気がつく」 — the automatic “when A, B follows.”
「春になると桜が咲く」 — the 「〜と」 condition, “as soon as ~ (inevitably)…”
「春になると、桜が咲く」 (come spring, cherry blossoms bloom), 「このボタンを押すと、電気がつく」 (press this button and the light comes on), 「私は疲れると、甘い物が食べたくなる」 (when I get tired, I crave sweets) — 「(verb dictionary) ＋ と」 marks an inevitable, automatic linkage: “as soon as ~, then…” This guide covers 「と」's three scenes — natural result, discovery, habit — and separates it from the other conditionals (たら／ば) (と vs たら has its own 〈たら vs と〉 guide).
Core: once the former happens, the latter inevitably (automatically) follows
「〜と」 = “as soon as ~,” an inevitable, automatic link from former to latter:
- ① Natural result (law, machine): 春になると桜が咲く, 押すと開く.
- ② Discovery (did the former, found the latter): 部屋に入ると、猫がいた (entered the room and (found) a cat).
- ③ Habit (every time…): 疲れると甘い物が欲しくなる (when tired, I crave sweets).
Common thread: once the former holds, the latter (inevitably, automatically) happens.
How to Connect
| Use | Form | Example |
|---|---|---|
| natural result | dictionary ＋ と | 押すと開く |
| discovery | dictionary ＋ と、〜た | 入ると、いた （when I went in, there they were） |
| habit | dictionary ＋ と | 疲れると |
例句解析
- 春になると、桜が咲きます。(Come spring, cherry blossoms bloom.) — natural result
- このボタンを押すと、電気がつく。(Press this button and the light comes on.) — mechanical inevitability
- 部屋に入ると、猫が寝ていた。(I entered the room and (found) a cat sleeping.) — discovery
- 私は疲れると、甘い物が食べたくなる。(When I get tired, I crave sweets.) — habit
- まっすぐ行くと、駅があります。(Go straight and there's the station.) — natural result (directions)
⚠️ Easy traps to avoid
① 「と」 can't be followed by volition, commands, requests, or invitations. ✗ 春になると、花見しよう (come spring let's blossom-view — wrong, the latter is an invitation). Use 「たら」 (春になったら、花見しよう). After 「と」, only an “inevitable, automatic result.”
② 「と」 marks “inevitable, every time,” not “a one-off hypothesis.” 押すと開く ((every time) press and it opens, a rule); for “if, on some occasion,” use たら (もし押したら). と leans “rule, inevitability.”
③ The “discovery” use: と ＋ past. 部屋に入ると、手紙が置いてあった (entered the room and found a letter) — did the former action and discovered the latter situation (former dictionary, latter past). A very everyday use of と.
🔄 Compare: と／ば／たら
| Form | Nuance | Volition after? |
|---|---|---|
| 〜と | inevitable, automatic (as soon as ~) | ✗ no |
| 〜ば | general hypothetical | △ limited |
| 〜たら | most versatile (hypothesis/completion/discovery) | ○ yes |
💡 The key point in use
The core of the 「と」 condition is “as soon as ~ (inevitably, automatically)” — three scenes: ① natural result (春になると桜が咲く = come spring blossoms bloom, 押すと開く = press and it opens, law/machine); ② discovery (部屋に入ると猫がいた = entered and found a cat, former dictionary ＋ latter past); ③ habit (疲れると甘い物が欲しくなる = when tired I crave sweets). The key rule: 「と」 can't be followed by volition, commands, requests, or invitations (use たら for those). So directions (まっすぐ行くと駅があります), explaining a machine (押すと動く), and stating rules fit と best. To split と from たら finely, see the 〈たら vs と〉 guide.
❓ Questions you might have
Q: How do I tell 「と」's three uses (natural result, discovery, habit) apart?
The core of all three is “once the former happens, the latter inevitably (automatically) follows,” just in different scenes: ① natural result — the inevitability of natural laws or machine operation (春になると暖かくなる = come spring it warms up, ボタンを押すと開く = press and it opens); ② discovery — did the former and unexpectedly found the latter situation (former dictionary, latter past: ドアを開けると、猫がいた = opened the door and found a cat); ③ habit — every time the former, the latter (お酒を飲むと、顔が赤くなる = drinking makes my face red). All are “inevitable linkage,” told by context.
Q: Why can't 「と」 be followed by 「〜しよう」「〜てください」?
Because 「と」 expresses an “inevitable, automatically occurring result” — the latter is “this just happens,” not “a person's volition, command, request, or invitation.” So: ✗ 春になると、旅行しよう (come spring let's travel — 「旅行しよう」 is an invitation, not allowed), ✗ 家に帰ると、電話してください (「電話してください」 is a request, not allowed). Use 「たら」 for these (春になったら旅行しよう, 家に帰ったら電話して). Remember: latter is “an action I/you will do” → use たら, not と. (See the 〈たら vs と〉 guide.)
🖊️ Practice Questions (5)
Q1. 「春になる___、花が咲きます。」 (a natural result)
(A) と (B) ば (C) たら (D) なら
Q2. 「このボタンを押す___、電気がつきます。」 (operating a machine)
(A) と (B) ば (C) たら (D) なら
Q3. 「部屋に入る___、猫が寝ていた。」 (discovered upon entering)
(A) と (B) ば (C) たら (D) なら
Q4. 次のうち、と條件が使えない文はどれ？
(A) 右に曲がると、コンビニがあります。
(B) 春になると、旅行しましょう。
(C) 春になると、暖かくなります。
(D) この道をまっすぐ行くと、駅があります。
Q5. 「疲れ___、すぐ休んでください。」 (a command: if you're tired, please rest) Which is correct?
(A) と (B) ば (C) たら (D) なら
Answer Explanations
1. (A) と ── a natural phenomenon (spring comes → flowers bloom), an inevitable result, uses と.
2. (A) と ── operating a machine (press the button → the light turns on), an objective fixed cause-and-effect, uses と.
3. (A) と ── the result discovered after entering the room (猫が寝ていた = past), a discovery usage, uses と.
4. (B) 旅行しましょう ── 「しましょう (volition/invitation)」 is a form that と cannot take. と conditionals aren't followed by volitional expressions. The other options (A)(C)(D) are all natural results → all can use と.
5. (C) たら ── 「休んでください (a command)」 = と can't attach, ば is also unnatural, なら has the wrong sense (なら = "if you are tired" with a conditional feel), so たら fits best (疲れたら = once you're tired, please rest).