Japanese phrase
___が理由です。 ___ ga ri yū de su
Meaning
___ is the reason.
When to use it
States what caused a situation. It gives a direct explanation in polite everyday speech and often answers a question about why something happened.
Example dialogue
どうして中止になったんですか？ dō shi te chū shi ni na tta n de su ka
Why was it canceled?
人手不足が理由です。 hito de fu soku ga ri yū de su
It was canceled because of staff shortages.