“〜koso”: Precisely / The Very 〜 (the emphatic particle) [JLPT N2]
By Nihongo to Japan · Updated July 3, 2026
Master 〜こそ to make your Japanese more persuasive!
“〜koso”: Precisely / The Very 〜 / This Time for Sure (the emphatic particle)
こそ is an emphatic particle that highlights the preceding word, meaning “precisely 〜, the very 〜.” Common uses: ① highlighting a target “this is precisely”: 「これこそ、本当の美味しさだ」 (this is the real deal); ② 「(time) + こそ」 for resolve “this time for sure”: 「今年こそ、合格するぞ」 (this year for sure I'll pass); ③ 「〜てこそ」 = “only by…”: 「苦労してこそ、本当の成長がある」 (only through hardship is there real growth); ④ 「〜からこそ」 = precisely because (see separate article).
🧠 Core nuance: putting the spotlight on this, “precisely, only”
The core is focusing, highlighting the preceding word: こそ singles out an element, excluding others, for “precisely this, only this.” ① With a noun, it highlights “precisely” (これこそ本物); ② with a time, it expresses the resolve “(I didn't before, but) this time for sure” (今年こそ); ③ 「〜てこそ」 expresses the necessary condition “only by doing…can one…” (努力してこそ報われる = only by trying are you rewarded). It makes the tone forceful and persuasive. Often paired with のだ.
📌 How to Connect
| Form | Use | Example |
|---|---|---|
| noun + こそ | precisely 〜, the very 〜 | これこそ |
| (time) + こそ | this time for sure (resolve) | 今年こそ |
| verb て-form + こそ | only by 〜 | 努力してこそ |
💬 Example Sentences
- これこそ、私が探していた本だ。(This is the very book I was looking for.) — precisely
- 今年こそ、絶対にマラソンを完走するぞ!(This year for sure, I'll definitely finish the marathon!) — resolve
- 苦労してこそ、本当の成長があるのだ。(Only through hardship is there real growth.) — only by
- 失敗してこそ、成功の喜びがわかる。(Only by failing do you understand the joy of success.) — necessary condition
- こちらこそ、ありがとうございます。(It's I who should thank you.) — emphasis (set greeting)
🔄 Compare: こそ vs は vs てこそ vs てはじめて
| Expression | Nuance | Example |
|---|---|---|
| 〜こそ | “precisely 〜, only 〜” (emphasis, focus) | これこそ本物 |
| 〜は | “(topic) 〜” (presenting a topic, neutral) | これは本だ |
| 〜てこそ | “only by doing…” (necessary condition) | 努力してこそ |
| 〜てはじめて | “only after doing… (for the first time)” (trigger) | 失ってはじめて気づく |
⚠️ Common Mistakes
- てこそ takes て-form: ✗ 努力するこそ → for “only by…” use 「verb て-form + こそ」 (努力してこそ).
- The resolve sense of time + こそ: 今年こそ = this time for sure (implying you didn't before); not just “precisely.”
- Confusing with てはじめて: てこそ (necessary condition) vs てはじめて (only after doing do you first realize) — different feel.
- Often with のだ: こそ is often paired with のだ・です for emphasis.
💡 Nuance & When to Use
こそ is an emphatic particle that highlights the preceding word: ① with a noun, “precisely, the very” (this is the real…); ② with a time, the resolve “this time for sure” (今年こそ); ③ 「〜てこそ」, the necessary condition “only by doing…can one…” (only by trying are you rewarded). It makes the tone forceful and persuasive, often paired with のだ. Distinguish from てはじめて (only after doing do you first realize). Common in speech and writing. A must at N2.
🎯 JLPT Exam Tips
- High-frequency N2: noun + こそ (precisely/only); time + こそ (this time for sure, resolve); verb て-form + こそ (only by…).
- Connection: てこそ takes the て-form.
- Distinction: てこそ (necessary condition) vs てはじめて (only after doing do you first realize).
🖊️ 練習題(5 題)
Q1. 「今年___、マラソンを完走するぞ!」(今年一定要跑完馬拉松!強烈決心)
(A) は (B) が (C) こそ (D) でも
Q2. 「苦労し___、本当の成長がある。」(只有吃過苦,才有真正的成長)
(A) てこそ (B) たから (C) たとたん (D) たが最後
Q3. 「こそ」の特徴は?
(A) 否定を強調する
(B) 前の要素を焦点化して「正に〜」「〜だけが」と強調する
(C) 時間の経過を表す
(D) 一般的な理由を示す
Q4. 「失敗し___、成功の喜びが分かる。」(只有失敗了,才能懂得成功的喜悅)
(A) てこそ (B) てから (C) たもの (D) たとたん
Q5. 「これ___が、本当に美味しい料理だ。」(這才是真正好吃的料理,強調這個)
(A) こそ (B) が (C) は (D) でも
答案解析
1. (C) こそ ── 「今年こそ(今年一定要!)マラソンを完走するぞ」= 今年こそ 帶有「之前沒做到,今年一定要」的強烈決心 → こそ。
2. (A) てこそ ── 「苦労してこそ(只有吃過苦),本当の成長がある(才有真正成長)」= てこそ 表達前句是後句的必要條件。
3. (B) ── こそ 的特徵:把前面的要素置於焦點,帶有「正是〜・只有〜」的強調(exclusivity or emphasis on that specific element)。
4. (A) てこそ ── 「失敗してこそ(只有失敗了),成功の喜びが分かる(才懂得喜悅)」= てこそ(必要條件的強調)。
5. (A) こそ ── 「これこそが(這才是!)本当に美味しい料理だ(真正好吃的料理)」= こそ 強調「這個(不是其他)才是正宗的」。