“〜ka 〜nai ka no uchi ni”: No Sooner Than, Almost Before [JLPT N1]

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

「席に着くか着かないかのうちに話し始めた」 — almost simultaneous, with a surprising speed.

「席に着くか着かないかのうちに話し始めた」 — before the first action finishes, the next connects

To describe something startlingly fast, 「彼は席に着くか着かないかのうちに、話し始めた」 (almost before he'd sat down, he started talking) — 「〜か〜ないかのうちに」 = almost before ～, already ～, used to express “the first action has barely been done when (at the same time) the next is already done.” It stresses two actions so fast you can't tell the order, a startling speed. This guide covers the “same verb dictionary form ＋ か ＋ ない-form ＋ か” attachment and separates it from 「が早いか／とたん／なり」 by that subtle order gap.

Core: in the ‘done-or-not' of the first action, the next has already happened

「verb dictionary form ＋ か ＋ (same verb) ない-form ＋ かのうちに」 means “in the instant the first action has barely been done, the next is already done”:

• ベルが鳴るか鳴らないかのうちに、彼は教室を飛び出した (almost before the bell finished ringing, he dashed out of the classroom).
• 子供は横になるかならないかのうちに、寝てしまった (the child fell asleep almost the moment it lay down).
• 「乾杯」と言うか言わないかのうちに、彼はもう飲み干していた (before “cheers” was even out, he'd already downed it).

Feel: “か〜ないか” = “done, or not (yet) done,” and “のうちに” = “within that instant.” Together = “in the instant the first action isn't quite fully done, the next has already happened” — the two actions nearly overlap, too fast to tell which came first. It's even earlier than 「〜が早いか (the first completes, the second immediately)」 — stressing the first is “barely not finished.” It corresponds to “almost before ～, no sooner ～ than ～, before ～ was even done ～.”

Attachment rules

Example sentences

• 電車のドアが閉まるか閉まらないかのうちに、彼は飛び乗った。(Almost before the train doors closed, he jumped aboard.)
• 授業が終わるか終わらないかのうちに、生徒たちは駆け出した。(Before the bell finished, the students dashed off.)
• 布団に入るか入らないかのうちに、いびきが聞こえてきた。(Almost the moment he got under the covers, snoring came.)
• 質問し終わるか終わらないかのうちに、彼は答え始めた。(Before I'd finished asking, he started answering.)
• 空が明るくなるかならないかのうちに、彼は家を出た。(As the sky was barely brightening, he left home.)

⚠️ Easy traps to avoid

① The attachment is “same verb: dictionary form ＋ か ＋ ない-form ＋ か ＋ のうちに.” This is the most error-prone attachment. It uses the same verb front and back — the dictionary form ＋ か in front, the same verb's ない-form ＋ か in back, then 「のうちに」: 着くか着かないかのうちに (○ both 「着く」), 鳴るか鳴らないかのうちに (○ both 「鳴る」). This “V(dictionary)か ＋ V(ない)か” structure literally is “(do) V, or (not) V” — expressing that blurry instant of “done-or-not.” Learners easily drop the middle 「か」 or use the wrong form (✗ 着いたか着かないか [first half in た-form — wrong, the first half is dictionary form]). Mnemonic: (dictionary form) か (same verb ない-form) かのうちに = almost before ～, already ～.

② It stresses ‘the first action is barely not finished,' a step earlier than 「が早いか.」 This is its subtlest and most core difference from near-synonyms. 「か〜ないかのうちに」's focus is “the instant the first action ‘isn't quite fully done'” — the first might even be ‘mid-way, not yet finished' when the second has already happened: 席に着くか着かないかのうちに (not quite fully seated — maybe just starting to sit, not settled), 話し終わるか終わらないかのうちに (before the words were even out). By contrast, 「〜が早いか」 is “the first completes, the second immediately connects” (the first is done) (see 〈が早いか〉). So 「か〜ないかのうちに」 captures the earlier, blurrier “not-yet-finished” instant. The English “almost before ～, before ～ was even done” is exactly this. Test: to stress “the first is not quite fully finished (in the done-or-not)” → か〜ないかのうちに.

③ Division of labor with 「が早いか／とたん／なり.」 These all express “the moment ～,” but differ subtly. 「か〜ないかのうちに」 = almost before ～, already ～ (the first ‘not quite done,' the earliest, blurriest instant): 着くか着かないかのうちに. 「が早いか」 = the moment ～, immediately ～ (the first ‘completes,' the second immediate, almost simultaneous, see 〈が早いか〉): 着くが早いか. 「や否や」 ≒ が早いか (immediately after the first completes, written). 「とたん(に)」 = the moment ～ (an instant, often unexpected result, た-form) (see 〈とたん〉): 着いたとたん. 「なり」 = the moment ～, immediately (often an unexpected／following act) (see 〈なり〉): 着くなり. Difference: か〜ないかのうちに earliest (first not yet done); が早いか／や否や first just completed; とたん an instant ＋ unexpected (た-form); なり the moment ～ immediately (a following act). In practice か〜ないかのうちに and が早いか both express “almost simultaneous, extreme speed” and are often near-interchangeable, with the former stressing “the first isn't finished.”

🔄 Compare with similar forms: か〜ないかのうちに／が早いか／とたん(に)／なり

💡 Quick takeaway

「〜か〜ないかのうちに」 = almost before ～, already ～ (the first isn't finished, the next connects) — three points: ① the attachment is “same verb: dictionary form か ＋ ない-form か ＋ のうちに” (着くか着かないかのうちに); ② it stresses the earliest instant, “the first is barely not finished,” a step earlier than 「が早いか (the first completes)」; ③ division of labor with 「が早いか (first just completed)／とたん (an instant, unexpected, た-form, see 〈とたん〉)／なり (see 〈なり〉).」 This pattern is vivid — “before the words were out, ～,” “fell asleep the moment they lay down” — capturing that extreme-speed instant of “in the done-or-not, the next has happened.” It's a written, narrative register, mostly describing others' unexpectedly swift actions. To write “almost simultaneous, startlingly fast,” this and 〈が早いか〉 both have speed (the former earlier, blurrier).

❓ FAQ

Q: 「か〜ないかのうちに」 and 「が早いか」 both express ‘the moment ～' — what exactly differs?

The difference is that tiny time gap of ‘whether the first action is fully done.' 「〜か〜ないかのうちに」 = almost before ～, already ～ (the first ‘not quite finished'): it captures “the blurry instant of the first's ‘done-or-not'” — the first might not even be fully done (maybe mid-way, not settled) when the next has already happened. It's “earlier”: 席に着くか着かないかのうちに、話し始めた (started talking almost before sitting — maybe not even settled in the seat), 言い終わるか終わらないかのうちに (before the words were done). The English “almost before ～, before the words were even out” is exactly it. 「〜が早いか」 = the moment ～, immediately ～ (the first ‘completes,' the second immediate): it's “the moment the first action completes, the second connects with no gap” — the first is completed, just with the second following extremely fast, almost simultaneous: 席に着くが早いか、食べ始めた (started eating the moment he sat [was seated]) (see 〈が早いか〉). Difference: 「か〜ないかのうちに」's first is ‘not quite fully done' (earlier, blurrier); 「が早いか」's first is ‘just completed' (the second immediately connects). Test: to stress “the first is not finished (in the done-or-not)” → か〜ないかのうちに; to stress “the first completes, the second immediate” → が早いか. Still, in practice both express “almost simultaneous, startling speed,” and many contexts are near-interchangeable (着くか着かないかのうちに ≒ 着くが早いか), differing only in that slight “first done or not” nuance.

Q: Must the two verbs before 「か〜ないかのうちに」 be the same? Can I use different verbs?

Use the same verb — this is its fixed structure. 「か〜ないかのうちに」's full form is “(a verb A's dictionary form) か (the same verb A's ない-form) かのうちに,” the same verb front and back, just one in the dictionary form (affirmative), the other in the ない-form (negative), joined by 「か,」 expressing that instant of “(did A) or (didn't do A)”: 着くか着かないか (both 「着く」: dictionary 「着く」 ＋ ない-form 「着かない」), 鳴るか鳴らないか (both 「鳴る」), 終わるか終わらないか (both 「終わる」). You can't use different verbs front and back (✗ 着くか座らないかのうちに) — because its meaning is “this action A, in the done-or-not,” which must be the same A. This “V(dictionary)か ＋ V(ない)か” contrast expresses “the critical instant of done/not-done” via the same verb's affirmative vs negative. Mnemonic: think of the verb first, front with dictionary form ＋ か, back with the same verb's ない-form ＋ か, then のうちに. Test: check whether front and back of 「か」 are the same verb's dictionary and ない-forms — yes → correct. This differs from 「が早いか (the verb's dictionary form appears once)」 — か〜ないかのうちに needs “the same verb appearing twice (dictionary ＋ ない-form),” so don't drop the middle negative.

🖊️ Practice Questions (5)

Q1. 「子供はベッドに入る___入らない___、眠ってしまった。」（fell asleep the moment (they) got into bed）

(A) か、かのうちに　(B) と、と　(C) ば、ば　(D) たら、たら

Q2. 「か〈ないかのうちに」の構造は?

(A) The same verb (dictionary form ＋ か ＋ ない-form ＋ かのうちに)　(B) Different verbs　(C) て-form ＋ か　(D) た-form ＋ か

Q3. 「席に着くか着かないかのうちに」の意味は?

(A) Had just sat down (barely even settled)

(B) Sat for a long time

(C) Didn't sit down

(D) Standing

Q4. 後件の時制は?

(A) Past tense (describes something that happens immediately after)

(B) Imperative form

(C) Volitional form

(D) Negative form

Q5. 接法が正しいのは?

(A) 鶴るか鶴らないかのうちに切れた。　(B) 鶴ったか鶴るかのうちに。

(C) 鶴ってか鶴らないか。　(D) 鶴るからないかのうちに。

Answer Explanations

1. (A) か、かのうちに ── Fell asleep the moment (they) got into bed (入るか入らないかのうちに).

2. (A) ── The same verb: dictionary form ＋ か ＋ ない-form ＋ かのうちに.

3. (A) ── Had just sat down.

4. (A) ── The following clause uses past tense.

5. (A) ── 「鶴るか鶴らないかのうちに」 is correct.