“kanarazushimo 〜wake de wa nai・to wa kagiranai”: Not Necessarily 〜 (partial negation) [JLPT N2]

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

「高い薬が必ずしも効くわけではない」 — puncturing an “always / all” overgeneralization.

「高いものが必ずしもいいとは限らない」 — expensive doesn't necessarily mean good

「値段が高いものが、必ずしもいいとは限らない」 (a pricey thing isn't necessarily good) — 「必ずしも〜ない／わけではない／とは限らない」 expresses “not necessarily ～, not always ～”: negating a “taken-for-granted” sweeping inference, leaving exceptions. The adverb 「必ずしも」 is the key signal — it always echoes a following negative. This guide covers 「必ずしも」's use and common pairings, separating it from the plain 「〜ない」 (N2).

Core: not necessarily ～, not always ～ (partial negation, leaving exceptions)

The adverb 「必ずしも」 ＋ a negative (〜ない／わけではない／とは限らない) = “not necessarily ～, not always ～, it's not (always) ～” — negating the inference that “one would assume it's always so,” pointing out exceptions:

• お金があれば必ずしも幸せだとは限らない (having money doesn't necessarily mean happiness).
• 多数意見が必ずしも正しいわけではない (the majority opinion isn't necessarily right).

Feel: “not necessarily …／not always …” — the core is partial negation: not a total negation, but “the ‘always, without fail' (people assume) doesn't hold; there are exceptions.” 「必ずしも」 is an adverb that echoes a negative — where it appears, the sentence ends in a negative. It's a written, formal expression.

Common pairings (必ずしも ＋ negative)

See it in context

• 有名な大学を出たからといって、必ずしも成功するとは限らない。(Graduating from a famous university doesn't necessarily mean success.)
• 高いレストランが、必ずしも美味しいわけではない。(An expensive restaurant isn't necessarily tasty.)
• 努力が必ずしも報われるとは限らないが、しないよりはいい。(Effort isn't necessarily rewarded, but it's better than none.)
• 多いことが必ずしもいいことではない。(More isn't necessarily a good thing.)
• 経験が長い人が、必ずしも優秀だとは限らない。(A person with long experience isn't necessarily excellent.)

⚠️ Easy traps to avoid

① 「必ずしも」 must pair with a ‘negative,' can't stand alone. The basic rule. 「必ずしも」 is an adverb that echoes a negative, so it must be followed by a negative (〜とは限らない・わけではない・ない), never an affirmative (×必ずしも正しい = ×). Its function is to negate “always, without fail” = “not necessarily.” See 「必ずしも」 and remember to end with a negative.

② 「必ずしも〜ない」 is ‘partial negation,' not ‘total negation.' It negates the over-inference “always, without fail (so),” meaning “not necessarily, not always (there are exceptions),” not “not … at all.” 必ずしも高くない = not necessarily expensive (maybe not always expensive, some cheap ones exist), not “not expensive at all.” For total negation use the plain 「〜ない」 (高くない = not expensive); for “not necessarily, not always (with exceptions)” use 「必ずしも〜ない」.

③ 「必ずしも〜わけではない」 vs 「必ずしも〜とは限らない」 are close in feel. Both are partial negation “not necessarily,” often interchangeable. 必ずしも〜わけではない = it's not (always) that ～ (negating an over-inference) (必ずしも嫌いなわけではない = it's not that I dislike it); 必ずしも〜とは限らない = not necessarily ～ (no guarantee it's all so) (必ずしも安いとは限らない = not necessarily cheap). Both are partial negation; 「とは限らない」 stresses “no guarantee, not all,” 「わけではない」 stresses “it's not (as you assume) that way.” (わけではない: see 〈わけではない〉; とは限らない: see 〈とは限らない〉.)

🔄 Compare with similar forms: 必ずしも〜ない／わけではない／とは限らない／あながち〜ない

💡 How to remember this

「必ずしも〜ない／わけではない／とは限らない」 = not necessarily ～, not always ～, its core partial negation: negating the over-inference “always, without fail (so),” pointing out “there are exceptions” (高いものが必ずしもいいとは限らない = expensive isn't necessarily good). Three points: ① 「必ずしも」 must pair with a negative — an adverb that echoes a negative, so the sentence must end in one (とは限らない・わけではない・ない); ② it's partial negation (not necessarily, exceptions exist), not total negation (必ずしも高くない ≠ not expensive at all); ③ it often combines with 「わけではない／とは限らない」 to strengthen the tone. A written expression; to indirectly point out in an argument “this doesn't necessarily hold, not always so,” 必ずしも〜ない nails it. (The partial-negation family: 〈わけではない〉〈とは限らない〉.)

❓ Quick FAQ

Q: How do 「必ずしも高くない」 and 「高くない」 differ? Both have ‘not.'

Whether it's ‘partial negation' or ‘total negation.' 「高くない」 = not expensive (total negation, plainly saying ‘not expensive'): この店は高くない (this shop isn't expensive — it's cheap/average). It's a plain, direct negation, asserting “not ….” 「必ずしも高くない」 = not necessarily expensive (partial negation, negating the inference ‘always expensive,' implying exceptions): ブランド品が必ずしも高くない (brand goods aren't necessarily expensive — most may be, but “always expensive” doesn't hold; cheap exceptions exist). It doesn't say “not expensive,” but “not (always) expensive, exceptions exist.” The key is the “partial” tone 「必ずしも」 brings: it negates “必ず (always, without fail),” so the whole means “not necessarily, not always (so),” leaving room for “sometimes yes, sometimes no.” Compare: 「便利ではない」 = not convenient (total negation) vs 「必ずしも便利ではない」 = not necessarily convenient (not always convenient, sometimes not). So: to assert “not …” use a plain negative; to say “not necessarily, not always (with exceptions)” use 「必ずしも〜ない」. This is useful in argument and reasoning — avoiding overstating, leaving room.

Q: Must 「必ずしも」 always have a negative after it? Can I say 「必ずしもそうだ」?

It must have a negative; you can't say 「必ずしもそうだ」 (×). 「必ずしも」 is a so-called “echoing adverb (陳述副詞)” — it fixedly echoes a certain sentence-final form, and what 「必ずしも」 echoes is a negative. So where 「必ずしも」 appears, the sentence must end in a negative (〜ない・〜とは限らない・〜わけではない・〜とは言えない, etc.), expressing “not necessarily.” E.g., 必ずしも正しいとは限らない (○ not necessarily right); 必ずしもそうなわけではない (○ not always so); 必ずしも成功するとは言えない (○ can't necessarily say it'll succeed). You can't say 「必ずしもそうだ」 (×) or 「必ずしも正しい」 (×) — because 「必ずしも」 itself demands a following negative; pairing it with an affirmative is a grammatical error. A few other “echoing adverbs” to remember: 決して〜ない (never), 全然〜ない (not at all), めったに〜ない (rarely), たいして〜ない (not much) — all pair only with a negative. So see 「必ずしも」 and reflexively put a negative at the end. For the partial-negation tone “not necessarily,” 「必ずしも ＋ negative」 is the standard combination.

🖊️ Practice Questions (5)

Q1. 「高い薬が必ずしも___。」(expensive medicine isn't necessarily effective)

(A) 効く　(B) 効くわけではない　(C) 効かない　(D) 効くはずだ

Q2. 「有名な大学を卒業した人が必ずしも___。」(graduating from a famous university doesn't necessarily mean success)

(A) 成功する　(B) 成功するとは限らない　(C) 成功した　(D) 成功すべきだ

Q3. What should follow 「必ずしも」?

(A) An affirmative form (〜する・〜だ)

(B) A negative form (〜ない・〜わけではない・〜とは限らない)

(C) A question form

(D) Either is fine

Q4. 「早起きは__体に良い__。(getting up early isn't necessarily good for you; emphasizing an exception)

(A) 必ず / だ　(B) 必ずしも / わけではない　(C) 必ずしも / べきだ　(D) 必ず / とは限らない

Q5. 「勉強ができる人が___。(people who are good at studying aren't necessarily socially skilled)

(A) 必ずしも社交的とは限らない　(B) 必ずしも社交的だ　(C) 必ず社交的ではない　(D) 必ずしも社交的になった

Answer Explanations

1. (B) 効くわけではない ── 「必ずしも効くわけではない (isn't necessarily effective)」→ 必ずしも + a negative form (わけではない).

2. (B) 成功するとは限らない ── 「必ずしも成功するとは限らない (doesn't necessarily succeed)」→ 必ずしも + とは限らない (denying inevitability).

3. (B) A negative form ── 必ずしも must be followed by a negative form (〜ない/〜わけではない/〜とは限らない).

4. (B) 必ずしも / わけではない ── 「早起きは必ずしも体に良いわけではない」→ 必ずしも + わけではない.

5. (A) ── 「必ずしも社交的とは限らない (not necessarily socially skilled)」→ 必ずしも + とは限らない, the most correct.