Intransitive vs Transitive Verbs: The Key Distinction (窓が開く vs 窓を開ける) [JLPT N4]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
A complete explanation of 「窓が開く」 vs 「窓を開ける」.
「窓が開く」 vs 「窓を開ける」 — it opens by itself vs someone opens it
「風で窓が開いた」 (the window opened in the wind) vs 「私が窓を開けた」 (I opened the window) — for the same “open,” Japanese has two verbs: intransitive (開く) = the thing changes by itself, takes 「が」; transitive (開ける) = someone does it, takes 「を」. This “intransitive/transitive” pairing is core N4 and where particles go wrong most. This guide sorts them by “who made it change” and helps you memorize the high-frequency pairs.
Core: intransitive (が, by itself) vs transitive (を, someone does)
- Intransitive = the thing changes／happens “by itself,” focus on “state, result,” takes が: ドアが開く (the door opens), 電気がつく (the light comes on).
- Transitive = “someone” acts on the thing, focus on “who did it,” takes を: ドアを開ける (open the door), 電気をつける (turn on the light).
Test: focus on “what happened to the thing” → intransitive が; on “what someone did” → transitive を.
Common intransitive/transitive pairs
| Intransitive (が) | Transitive (を) | Meaning |
|---|---|---|
| 開く (あく) | 開ける (あける) | open |
| 閉まる | 閉める | close |
| つく | つける | (light) come on／turn on |
| 消える | 消す | disappear／turn off |
| 始まる | 始める | begin |
Examples in context
- 風でドアが開いた。(The door opened in the wind.) — intransitive (by itself)
- 私がドアを開けた。(I opened the door.) — transitive (I did it)
- 電気が消えた。(The light went out.) — intransitive
- 電気を消してください。(Please turn off the light.) — transitive
- 授業が始まった。(Class began.) — intransitive
⚠️ Easy traps to avoid
① Don't mismatch particles. Intransitive takes が (窓が開く), transitive takes を (窓を開ける). English “open the window” doesn't distinguish, but Japanese matches the particle to the verb.
② You can't derive it from “add る or not.” The pairs follow no single rule (開く↔開ける, 閉まる↔閉める, つく↔つける, 消える↔消す all differ) — memorize them in pairs.
③ 「〜てある」 goes with transitive, 「〜ている」 with intransitive. 窓が開けてある (someone left it open = transitive ＋ てある, deliberate state); 窓が開いている (it's open = intransitive ＋ ている, plain state).
🔄 Compare with similar forms: intransitive／transitive／てある・ている
| Form | Nuance | Example |
|---|---|---|
| intransitive ＋ が | thing changes／state | 窓が開く |
| transitive ＋ を | someone acts | 窓を開ける |
| intransitive ＋ ている | (natural) ongoing state | 窓が開いている （the window is open） |
| transitive ＋ てある | a deliberately-made state | 窓が開けてある （the window has been left open by someone） |
💡 The one thing to remember
Intransitive/transitive is a big N4 gate, but the mindset is simple: does the sentence stress “what the thing did by itself” or “what someone did”? — the former is intransitive ＋ が (窓が開く), the latter transitive ＋ を (窓を開ける). The nuisance is that the pairs follow no rule and must be memorized together (開く／開ける, つく／つける…), so learn one pair at a time with a situation. One practical point: 「電気がついている (the light is on)」 uses the intransitive and is super common. Master the dozen-plus frequent pairs and you've cleared it.
❓ Common questions
Q: How do I decide intransitive vs transitive?
By the focus and particle: stressing “the thing changed／happened” (no particular doer) → intransitive ＋ が (ドアが開いた = the door opened); stressing “someone acted on it” → transitive ＋ を (ドアを開けた = (I) opened the door). A clear doer with を is usually transitive.
Q: Is there a rule to derive the pairs?
No single rule. 開く／開ける, 閉まる／閉める, つく／つける, 消える／消す, 始まる／始める… all change form differently — memorize them in pairs. Group them by situation (open/close, begin, appear/disappear) and learn them with example sentences.
🖊️ Practice Questions (5)
Q1. 「風で窓___開いた。」(the window opened due to the wind — occurs by itself)
(A) が (B) を (C) に (D) で
Q2. 「私が窓___開けた。」(I opened the window)
(A) が (B) を (C) に (D) で
Q3. 「電気が___。」(the light went out — occurs by itself)
(A) 消した (B) 消えた (C) 消してある (D) 消される
Q4. 「窓が開け___」(the window is deliberately left open — an intentional state)
(A) ている (B) てある (C) ておく (D) てしまう
(A) 動作が自然に起こる・主語は「が」（誰がしたか不問）
(B) 必ず object「を」をとる
(C) 必ず「てある」と使う
(D) 命令にしか使えない
Answer Explanations
1. (A) が ── The intransitive 「開く（あく）」takes 「が」on the subject (窓が開いた = the window opened by itself).
2. (B) を ── The transitive 「開ける」takes 「を」on the object (窓を開けた = opened the window).
3. (B) 消えた ── The intransitive 「消える」(the light went out by itself); the transitive would be 「消した」.
4. (B) てある ── 「てある」is the transitive て-form ＋ ある = a state someone deliberately created (窓が開けてある).
5. (A) ── Intransitive = the action occurs by itself, the subject takes が, no object needed.