我不知道他是谁。

I don't know who he is.

Traditional

我不知道他是誰。

Pinyin

Wǒ bù zhīdào tā shì shéi.

Bopomofo

ㄨㄛˇ ㄅㄨˋ ㄓ ㄉㄠˋ ㄊㄚ ㄕˋ ㄕㄟˊ。

This sentence is from Tatoeba, contributed by fucongcong, with the English translation by CK. It is used here under CC BY 2.0 FR.

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