koto ni naru ことになる
Predicative phrase meaning: it is decided/arranged that.
1. After dictionary form of verb
今度東京に転勤することになりました。
Kondo toukyou ni tenkin suru koto ni narimashita.
It is decided that I'll be transferred to the Tokyo office shortly.
来年から他の会社で働くことになった。
Rainen kara hokano kaisha de hataraku koto ni natta.
It's been decided that I'll work for another company next year.
1. After dictionary form of verb
今度東京に転勤することになりました。
Kondo toukyou ni tenkin suru koto ni narimashita.
It is decided that I'll be transferred to the Tokyo office shortly.
来年から他の会社で働くことになった。
Rainen kara hokano kaisha de hataraku koto ni natta.
It's been decided that I'll work for another company next year.
Japanese for Beginners