“〜ki ni naru・〜ki ga suru・〜ki ni suru”: Bother / Have a Feeling / Mind (subtle feelings) [JLPT N3]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

結果気になる」「呼ばれた気がする」「気にするな」 — bothered, a hunch, or actively minding.

気になる? 気がする? 気にする? — sorting out three 「気」 idioms at once

「結果が気になる」 (I'm curious about the result), 「誰かに見られている気がする」 (I have a feeling I'm being watched), 「小さなミスを気にする」 (fretting over a small mistake) — these three 「気」 idioms are close in meaning yet distinct: 気になる = (naturally) be curious about, weigh on one's mind; 気がする = have a feeling, a hunch (no firm basis); 気にする = (actively) mind, dwell on. This guide sorts out this 「気」 set at once, alongside 「気をつける」.

Core: natural curiosity vs subjective hunch vs actively minding

The three 「気」 differ in feel:

Difference: 気になる naturally draws attention; 気がする is a subjective feeling; 気にする is actively minding.

How to Connect

FormFeelExample
〜が気になるnaturally curious (が)結果が気になる (I'm anxious about the result)
〜(plain form)気がするhave a feeling忘れた気がする (I feel like I forgot something)
〜を気にするactively mind (を)失敗を気にする (I'm hung up on my failure)

Example sentences

⚠️ Common mistakes to avoid

気になる (が, natural) vs 気にする (を, active). The particle and the agency both differ! 気になる = が (something ‘naturally' draws your attention, weighs on you, involuntarily) (結果気になる = the result weighs on me); 気にする = を (you ‘actively' dwell on, mind something) (結果気にする = you fret over the result). The former is “it draws me,” the latter “I mind it.” To tell someone “don't worry about it,” use 「気にしないで」 (active), not 「気にならないで」.

「気がする」 takes the plain form, meaning ‘a feeling with no firm basis.' 気がする = “have a feeling, seem like” (a subjective hunch/impression, no firm basis): 雨が降る気がする (I have a feeling it'll rain), どこかで会った気がする (I feel like we've met somewhere). It takes the plain form (verb/adjective/noun + な/の + 気がする). It's “can't say why, but I have this feeling.”

Separate it from 「気をつける」 (be careful, take care). 気をつける = be careful, watch out (mind safety/health) (車に気をつけて = watch for cars, 体に気をつけて = take care of yourself); different from “be curious (気になる), mind (気にする), feel (気がする).” 気をつける is “take heed, be careful” — don't mix it with this set.

🔄 Nuance & comparison: 気になる/気がする/気にする/気をつける

FormFeelExample
〜が気になるnaturally curious, weighs on you (が)結果が気になる (I'm anxious about the result)
〜気がするhave a feeling (plain form)忘れた気がする (I feel like I forgot something)
〜を気にするactively mind, dwell on (を)人目を気にする (worry about what others think)
〜に気をつけるbe careful, watch out (に)車に気をつける (watch out for cars)

💡 An exam judgment tip

This 「気」 set is sorted by particle and feel: ① 気になる(が)= naturally curious, weighs on you (結果が気になる = the result won't leave my mind, involuntary — “it draws my attention”); ② 気がする(plain form +)= a subjective feeling/hunch with no firm basis (できる気がする = I have a feeling I can, “can't say why but I feel it”); ③ 気にする(を)= actively mind, dwell on (失敗を気にする = you fret over the failure; “don't worry” is 「気にしないで」). The easiest error is 気になる vs 気にする — が (naturally weighs on you) vs を (actively mind). Also 「気をつける (be careful)」 is a separate matter — don't mix it in. To precisely say “curious/have a feeling/mind,” just remember the particle.

❓ Quick FAQ

Q: How do I tell 「気になる」 from 「気にする」? (super easy to confuse)

By “naturally weighs on you (involuntary)” vs “actively mind (you dwell on it),” and the particle differs too. 「気になる」 = が (something ‘naturally' surfaces, draws your attention, weighs on you, involuntarily): 試験の結果が気になる (the exam result weighs on me — it naturally draws my attention), 隣の話し声が気になって集中できない (the talking next door distracts me — involuntarily drawn), あの人のことが気になる (I'm curious about that person — thinking of them despite myself). Its core is “the thing/person naturally draws me.” 「気にする」 = を (you ‘actively' dwell on, mind something): 失敗を気にするな (don't dwell on the failure — don't actively mind it), 人の目を気にしすぎ (you mind others' eyes too much — actively dwelling), 細かいことを気にしない性格 (an easygoing nature that doesn't fuss — not actively minding). Its core is “I actively mind it.” So: “(a thing) naturally weighs on me” → が気になる; “(I) actively mind” → を気にする. To tell someone “don't worry,” it's always 「気にしないで」 (active), not 「気にならないで」. In a nutshell: が気になる (passively weighs on you), を気にする (actively mind).

Q: What is 「気がする」? How do I tell it from 「気になる」?

「気がする」 = have a feeling, seem like, a sense (a subjective hunch/impression, no firm basis): it takes the plain form, meaning “can't say the exact reason, but I have this feeling”: 雨が降る気がする (I have a feeling it'll rain — a hunch), どこかで会った気がする (I feel like we've met somewhere — a vague impression), うまくいく気がする (I have a feeling it'll go well — intuition), 何か忘れている気がする (I feel like I'm forgetting something). It's a subjective feeling, intuition, not necessarily grounded. Difference from 「気になる」: 気がする = ‘I have a (…) feeling' (a subjective hunch/impression); 気になる = ‘something weighs on me, draws my attention' (drawn by something). E.g., 「彼が怒っている気がする」 = I feel like he's angry (my subjective judgment); 「彼のことが気になる」 = I'm curious about him (he draws my attention/concern). So: a subjective “I feel like…” → 気がする; “(something) weighs on me” → 気になる. One is a “feeling,” the other “weighing on you.”

🖊️ Practice Questions (5)

Q1. 「明日の面接の結果が___、落ち着かない。」(worried about the result)

(A) 気になって (B) 気にして (C) 気がして (D) 気をつけて

Q2. 「誰かに呼ばれた___。」(I have a feeling someone called me)

(A) 気がする (B) 気になる (C) 気にする (D) 気をつける

Q3. What is the difference between 「気になる」 and 「気にする」?

(A) 気になる = (spontaneously) to be concerned/preoccupied; 気にする = (actively) to mind

(B) They are exactly the same

(C) 気になる = actively minding

(D) 気にする = to have a feeling

Q4. What does 「気がする」 express?

(A) a subjective feeling with no firm basis (a hunch)

(B) an objective fact

(C) a strong command

(D) a polite request

Q5. Which usage is natural?

(A) 細かいことを気にするな。 (B) 細かいことを気になるな。

(C) 結果を気がする。 (D) 見られている気にする。


Answer Explanations

1. (A) 気になって ── Spontaneously concerned about the result.

2. (A) 気がする ── A feeling someone called (a subjective hunch).

3. (A) ── 気になる spontaneously concerned; 気にする actively minding.

4. (A) ── A subjective feeling with no firm basis.

5. (A) ── 「気にするな」 (don't mind it) is correct.

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