ことになる
(Kotoni naru)
Indicates that a decision has been made or an outcome has been determined by external factors.
Connection rules
- +Verb (Dictionary form) + ことになる
- +Verb (ない-form) + ことになる
Examples
1.
来月から大阪の支店へ転勤することになった。

Raigetsu kara oosaka no shiten he tenkin suru koto ni na ta.
It has been decided that I will transfer to the Osaka branch next month.
「A surprise job transfer」
2.
予約が取れなかったので、別の店へ行くことになった。

Yoyaku ga tore naka ta node, betsu no mise he iku koto ni na ta.
Since we couldn't get a reservation, we ended up going to a different shop.
「Changing dinner plans」
Practice
It has been decided that I will return to my country next month because of my father's illness.
父の病気で、来月___。
Romaji also accepted