〜ことにする expresses making a decision to do something. Unlike 〜ようにする which emphasizes ongoing effort, 〜ことにする marks a clear decision point.
Personal decisions - Choices you make deliberately
Life changes - Significant decisions about your future
Compare: 〜ことにする (decision) vs 〜ようにする (effort/habit) vs 〜ことになる (external decision/circumstance).
See examples below for varied real-world usage.
ことにする = decision, ようにする = effort
- 明日から運動することにした (decided to exercise)
- 運動するようにしている (making effort to exercise)
ことになる = decision made by others/circumstances
Past tense ことにした for completed decisions
I decided to start studying Japanese from next month.
I decide not to drink alcohol today.
I decided to quit my job.
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