どなた～ (donata～)
Explanation
A polite way to ask 'who', used for asking about someone's identity or when seeking information about an unknown person.
Formation
どなた
Detailed Explanation
The word どなた is a polite version of the question word だれ (who). It is used when asking about someone's identity or when seeking information about an unknown person in a polite or formal context. It can be used in questions and sometimes with も to express 'no matter who'.
Examples
すみません、どなたが山田さんですか？
Sumimasen, donata ga Yamada-san desu ka?
Excuse me, who is Mr. Yamada?
どなたも知っている有名な俳優です。
Donata mo shitte iru yuumei na haiyuu desu.
He is a famous actor whom everyone knows.
明日のパーティーにはどなたが来ますか？
Ashita no paatii ni wa donata ga kimasu ka?
Who is coming to the party tomorrow?
どなたか手伝っていただけますか？
Donata ka tetsudatte itadakemasu ka?
Could someone please help me?
Grammar content sourced from hanabira.org.