〜ずにはおかない・〜ないにはおかない

Must do...; Will definitely do...

1. Overview

「〜ずにはおかない」 is a Japanese expression that indicates a strong determination or obligation to perform a certain action. It suggests that the speaker feels compelled to take the action and that it will not be overlooked.

2. Structure

• Grammar Structure:

  • Verb (negative form) + ずにはおかない

• Explanation: The expression combines the negative form of a verb (which indicates that the action is not being performed) with 「おかない」 to express that the action must be done.

3. Usage Explanation

• Connection: It emphasizes the necessity of completing an action, often conveying a sense of duty or strong intention.

• Usage: This expression is used in both formal and informal contexts, typically to convey the importance of an action that the speaker feels strongly about.

• Translation: Generally translated as “must do...” or “will definitely do...”.

4. Alternative Expressions

• 〜なければならない: Another way to express obligation or necessity, often more formal.

5. Similar Expressions

• 〜せざるを得ない: Indicates that one has no choice but to do something, often due to external circumstances.
• 〜ないわけにはいかない: Similar in meaning, indicating that one cannot avoid doing something.

6. Notes

• Context: 「〜ずにはおかない」 is often used in contexts where the speaker wants to emphasize their commitment or obligation to take action.

• Tone: The expression has a strong tone of determination and is often used to express feelings of responsibility.

7. Example Sentences

1. この問題を解決せずにはおかない。
   I must solve this problem.

2. 彼女のために、私も協力せずにはおかない。
   For her sake, I will definitely cooperate.

3. このプロジェクトを成功させずにはおかない。
   I must ensure the success of this project.

4. 約束したことは、守らずにはおかない。
   I will definitely keep my promise.

5. この機会を逃さずにはおかない。
   I must not miss this opportunity.

8. Summary

「〜ずにはおかない」 expresses a strong determination or obligation to perform an action. It emphasizes the necessity of the action and conveys the speaker's commitment to fulfill their responsibilities.