For the same reason you speak English. That's their language.
(However English is not your native language, I think)
In Chinese, "speak" is translated as "说" (shuō).
hello, speak chinese? means hello, do you speak chinese?
You speak it
Because it's their native language.That's like asking why the French speak French or the English Speak English or the Chinese speak Chinese.
"I can speak Chinese" in Chinese is "我会说中文 (wǒ huì shuō zhōngwén)."
Chinese
No, I don't. I speak English.
Yes, he did learn Chinese.
Some Chinese Americans speak and learn a little of the Chinese language, but others just speak English as their first language. As being Chinese American myself, I say that I had to learn Chinese from my parents and Chinese school, while balancing those skills learning at normal schools (like talking English, instead of Chinese).
785 is Chinese channel they speak Chinese
Approximately 2.2% of the Australian population speak Chinese as their primary language at home.
Mandarin or Cantonese