You use this to say you have decided to do something regularly. It is a rule you made for yourself and you keep doing it.
Verb [dictionary form] + ことにしているPrimary
Verb [ない-form] + ことにしている
You use this to say you have decided to do something regularly. It is a rule you made for yourself and you keep doing it.
健康のため、毎朝３０分ジョギングをすることにしています。
For my health, I make it a rule to go jogging for 30 minutes every morning.
環境のために、夜９時以降は電気をつけっぱなしにしないことにしている。
For the environment, I make it a rule not to leave the lights on after 9 PM.
学生時代は、どんなに忙しくても週に一冊は本を読むことにしていた。
During my student days, I made it a rule to read at least one book a week, no matter how busy I was.
彼は人前で他人の悪口は絶対に言わないことにしているから、信用できるよ。
He makes it a rule to never speak ill of others in public, so you can trust him.
弊社では、重要な決定は必ず会議で議論することにしております。
At our company, we make it a rule to always discuss important decisions in meetings.
This grammar shows you chose a habit. It is like a rule you made for yourself. You keep doing it on purpose. It is not for things that just happen. It is not for things you cannot control. For example, you cannot choose to catch a cold.
This is different from "〜ようにしている." That means you are trying to do something. This means you have already decided to do something. You do it regularly. You follow a rule you made for yourself.
Don't use this when you cannot control the action. For example, you cannot say "I make it a rule to understand Japanese."
Track your mastery
Kumi's KMT system tracks your mastery across kanji, vocabulary, grammar, and reading. Create a free account to use it on 220,000+ concepts.