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koto ni shite iru ことにしている
Predicative phrase meaning: make a practice of (doing), make it a rule to (do)
1. After dictionary form of verb 寝る前に本を読むことにしています。 Neru mae ni hon o yomu koto ni shite imasu. I make it a rule to read (a book) before going to bed. 2. After nai-form of verb 夜ふかししないことにしています。 Yofukashi shinai koto ni shite imasu. I make it a rule not to stay up late.