こそkoso“precisely; for sure; the very”

こそ means precisely; for sure; the very. It is a JLPT N3 grammar pattern used to emphasize the preceding word as the true or important one.

This grammar point often appears in neutral Japanese. If you want to emphasize the preceding word as the true or important one, こそ is a useful pattern to learn.

What does こそ mean?

Use こそ when you want to emphasize the preceding word as the true or important one.

Natural translations include:

• precisely; for sure; the very

How to form こそ

Noun / phrase + こそ

Examples of the pattern:

• 今こそ
• こちらこそ
• 努力こそ

When is こそ used?

Use こそ in situations like:

• strong emphasis
• polite responses like こちらこそ
• stating what really matters

Tone and register:

• neutral
• Common in JLPT reading, grammar questions, and natural Japanese sentences

こそ example sentences

• 今こそ行動するべきだ。 — Now is precisely the time to act.
• こちらこそありがとうございます。 — No, I should be the one thanking you.
• 努力こそ成功の鍵だ。 — Effort is the very key to success.
• あなたにこそ、この仕事を任せたい。 — You are exactly the person I want to entrust this work to.
• 失敗した時こそ、成長のチャンスだ。 — Times of failure are precisely chances to grow.

After reading each sentence, ask what job こそ is doing: emphasizing the preceding word as the true or important one.

Nuance of こそ

The key nuance is exclusive or corrective emphasis on what truly matters.

This matters because こそ does more than translate one English phrase. It tells the reader how the speaker is framing the situation, whether as emphasis, contrast, obligation, approximation, or evidence.

For example:

• In context, it sounds natural when the surrounding sentence supports the nuance.
• Compared with は, it has a different focus and level of formality.

こそ vs は

Both こそ and は can appear in related situations, but they are different.

こそ:

• means precisely; for sure; the very
• fits the specific N3 pattern and nuance explained above

は:

• は marks a topic; こそ highlights that topic as the exact or important one

Quick contrast examples:

• Target: 今こそ行動するべきだ。 — Now is precisely the time to act.
• Compare: Try replacing it with は and check whether the nuance still matches.

Common mistakes with こそ

Watch out for these mistakes:

• Putting こそ after the wrong word
• Overusing it in casual sentences where it sounds dramatic
• Confusing こちらこそ as a literal “this side” phrase

A helpful practice method is to write one sentence with こそ, then rewrite it with は.

Is こそ on the JLPT?

Yes. こそ is commonly taught as JLPT N3 grammar.

That means learners should be able to:

• recognize it in reading
• understand its nuance in context
• use it in simple original sentences

Practice questions for こそ

• Say now is exactly the time.
• Reply “I should thank you.”
• Say effort is what matters.

Learning path for こそ

To learn こそ efficiently, review the formation first, then compare it with the closest existing grammar point before writing your own sentence.

1. First, make sure you can form こそ without looking at the pattern chart.
2. Next, compare it with は.
3. Finally, write sentences where こそ is necessary; then check whether replacing it with は changes the meaning.

Related grammar to review next

• さて — because it helps connect ideas in explanations, transitions, or conclusions.
• 確かに（たしかに） — because it helps connect ideas in explanations, transitions, or conclusions.
• むしろ — because it helps connect ideas in explanations, transitions, or conclusions.
• すなわち — because it helps connect ideas in explanations, transitions, or conclusions.

Learn こそ with Hane

If you want to review こそ together with the related patterns above, Hane helps you connect grammar, kanji, and vocabulary in short, focused sessions.

Browse more lessons here:

• All grammar lessons
• JLPT N3 grammar lessons