事になる
1
to have been decided (so) that;to have been arranged (so) that
usu. sentence ending
１週間の休暇を取っても良い事になった。
I was allowed to take a week off.
2
to be the result (of);to be the outcome
苦労と心配で彼の健康はそこなわれることになった。
Toil and worry caused his health to break down.
3
to be the reason (for)
あなたが言っていることからすれば、彼はそこにいなかったことになる。
It follows from what you say that he was not there.