Here's a breakdown:
* Mongolian: His native tongue and the language of his court.
* Persian: The language of the court and administration, as well as literature and scholarship.
* Chinese: The language of the people he ruled in China.
It's important to note that Kublai Khan probably didn't speak any of these languages in a perfectly fluent way. He would have likely used a blend of languages and dialects in his daily life, and his primary language of communication would have shifted depending on the situation.