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N3
〜ことにする (〜koto ni suru)
〜ことにする

to decide to, to make a point of, to choose to

💡 Nuance & Usage: Expresses a personal decision or resolution made by the speaker. It's about 'making it a rule' or 'deciding' to do something. Contrast with 「〜ことになる」which implies a decision made by others or circumstances. (V-る/V-ない + ことにする)

📝 Example Sentences

明日から毎日運動することにした。
I decided to exercise every day from tomorrow.

Practice Quiz

Test your understanding of "〜ことにする"!

健康のため、エレベーターではなく階段を使う_______。
🎉 正解 / Correct!
日本語: 「〜ことにした」は、話し手が自分で何かを決定したときに使います。
English: 「〜ことにした」 (koto ni shita) is used when the speaker personally decides to do something, in this case, to use stairs for health.
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