“〜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 August 6, 2026

「結果が気になる」「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

① 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) (結果が気になる = the result weighs on me); 気にする = を (you ‘actively' dwell on, mind something) (結果を気にする = 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」.

② 「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.”

③ 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)

“Naturally curious, weighs on you” → が気になる; “have a groundless feeling” → 気がする; “actively mind, dwell on” → を気にする; “be careful, watch out” → に気をつける. 気になる is involuntary, 気にする active, 気がする a feeling, 気をつける caution.

💡 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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