Japanese phrase
___することになりました。 ___ su ru ko to ni na ri ma shi ta
Meaning
It has been decided that I will ___.
When to use it
States that a future action has been decided. It often announces a personal change or plan in a polite, matter-of-fact way.
Example dialogue
来月から大阪へ転勤することになりました。 rai getsu ka ra ō saka e ten kin su ru ko to ni na ri ma shi ta
I am going to be transferred to Osaka next month.
そうなんですね。頑張ってください。 sō na n de su ne gan ba tte ku da sa i
I see. Good luck.