Use 果たす to describe bringing a duty, promise or role to completion.
The idea
果たす is a transitive godan verb. Mark the obligation, promise or role with を: 責任を果たす means fulfill a responsibility. Its polite form is 果たします and its て form is 果たして.
| Dictionary form | Polite non-past | Polite negative | Polite past | て form |
|---|---|---|---|---|
| 果たす | 果たします | 果たしません | 果たしました | 果たして |
Examples
- 彼は約束を果たしました。He kept his promise.
- 私たちは責任を果たします。We fulfill our responsibilities.
- 彼女は重要な役割を果たしました。She played an important role.
- 会社は契約の義務を果たしていません。The company has not fulfilled its contractual obligations.
- 選手たちは目標を果たしました。The athletes achieved their goal.
- 約束を果たすために、彼は戻ってきました。He came back to keep his promise.
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Watch out
果たす suggests carrying something through, not merely starting work. 役割を果たす means play or fulfill a role; it does not mean to give someone a role.
Try it yourself
＿。（果たす→ます）
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果たします
果たします is the polite non-past: the final す changes to し before ます.
＿。（果たす→て）
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果たして
果たして is the て form of a godan verb ending in す.
彼は約束＿果たしました。（を／に）
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を
を marks 約束 as the promise being fulfilled.
Practice round
Answer questions, then rebuild Japanese sentences where available. We keep your score.
＿。（果たす→ます）
＿。（果たす→て）
彼は約束＿果たしました。（を／に）
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Write a sentence about a promise you fulfilled, then change it to the polite past.