"Where was your friend born?" is the correct way to ask where a person was born in Engpsh.

The phrase "where" is used to ask about the location or place of something, and "born" is the past participle of the verb "to be born," which means to come into existence or to be brought into the world as a baby.

Here are some examples of this phrase in different contexts:

"Where was your friend born?" (Asking about the location where a person was born)
"I was born in New York City." (Stating the location where the speaker was born)
"My friend was born in Paris, France." (Stating the location where the friend was born)

In Chinese, this phrase can be translated as: "你的朋友在哪里出生？"