〜てこそ

Only after...; Only by...; Only when...

1. Overview

「〜てこそ」is used to express that a certain condition or action must be fulfilled before another action or result can be realized. It emphasizes that the subsequent situation can only happen after the first condition is met.

2. Structure

1. Verb (て-form) + こそ
   Used to indicate that the action in the "て-form" is a prerequisite for the result that follows.

3. Usage Explanation

• Indicating a prerequisite:
  This expression emphasizes that something can only occur after a specific condition is fulfilled.

• English Translation:
  It can be translated as “only after...,” “only by...,” or “only when...”.

4. Example Sentences

1. 努力してこそ、成功が得られる。
   Only through hard work can success be achieved.

2. 真剣に取り組んでこそ、良い結果が得られる。
   Only by tackling it seriously will good results come.

3. 話し合ってこそ、理解が深まる。
   Only by discussing can understanding deepen.

4. 経験してこそ、本当の意味がわかる。
   Only after experiencing it can you understand its true meaning.

5. 信じてこそ、前に進める。
   Only by believing can you move forward.

5. Key Points to Note

• Emphasis on Conditions:
  This expression strongly emphasizes the importance of the prerequisite action or condition for achieving a desired outcome.

• Formal and Informal Use:
  It can be used in both formal and informal contexts but is often found in more serious discussions or writings.

6. Similar Grammar

• 〜て始めて: Indicates that something can only occur after a certain condition is fulfilled, but typically emphasizes the initiation of a new state.
  • Example: 勉強して始めて、試験に合格できた。
    Only after studying did I pass the exam.

7. Alternative Grammar

• 〜からこそ: Emphasizes that the preceding action is the reason for the subsequent result, similar to "only because...".
  • Example: あなたがいるからこそ、私は頑張れる。
    Only because you are here can I strive hard.

8. Summary

「〜てこそ」is an expression used to indicate that a certain condition or action must be fulfilled for another action or result to occur. It highlights the importance of the prerequisite condition and is applicable in various contexts, providing clarity about the necessary steps to achieve a desired outcome.