Japanese phrase
どうしてですか？ dō shi te de su ka
Meaning
Why is that?
When to use it
Asks for a reason in a polite way. It is common in daily conversation when information is unclear or unexpected.
Example dialogue
今日は早く帰ります。 kyō wa haya ku kae ri ma su
I am going home early today.
どうしてですか？ dō shi te de su ka
Why is that?