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The meaning of -koto ni naru 〜ことになる – 意味

It has been decided that…
It will be decided that…

Please have in mind that the decision is made by the others(schools, companies, other friends, a natural course of the event, etc) in this grammar!

When you talk about your own decision, you will use -koto ni suru(〜ことにする) not -koto ni naru(〜ことになる)!

If you hear koto to narimasu(こととなります) instead of koto ni narimasu(ことになります), it means they talk politer but the meaning is the same!

How to form with -koto ni naru 〜ことになる – 接続

verb dictionary form	〜ことになる
verb ない-form

Some examples – 例文

来月の出張は田中さんが行くことになりました。
Raigetsu no shucchou wa Tanaka-san ga iku koto ni narimashita.
As for a business trip next month, it’s been decided that Tanaka-san will be the one who’s going.

来年アメリカ支店へ転勤することになりました。
Rainen Amerika-shiten he tenkin suru koto ni narimashita.
It’s been decided that I will be transferred to the America branch office next year.

来週の誕生日パーティーはどこですることになりますか。
マリアさんの家ですることになりますよ。
Riashuu no tanjyoubi paatii wa doko de suru koto ni narimasu ka?
Maria-san no ie de suru koto ni narimasu yo.
Where it will be (decided for you guys to do) the birthday party next week?
It will be decided to be at Maria’s home.

９月から新しい学生がクラスに入ってくることになるそうですよ。
Kugatsu kara atarashii gakusei ga kurasu ni haitte kuru koto ni naru sou desu yo.
I hear a new student will come to enroll in our class in September.

You cannot say your own decision, so this is a bad example:
長く伸ばした髪をあさって切ることになりました。
Nagaku nobashita kami wo asatte kiru koto ni narimashita.
It’s been decided to cut my hair that I grew so long.
This sounds unnatural! Unless you are a Japanese idol who is being programmed when to cut your hair!

instead this sounds far natural,
長く伸ばした髪をあさって切ることにしました。
Nagaku noboashita kami wo asatte kiru koto ni shimashita.
I have decided to cut my hair that I grew long.
(Remember -koto ni suru(〜ことにする)is for your own decision, right?)