of course!
那还用说！
You bet!
— 功夫 (2004)
那还用说
That goes without saying.
— 母亲 (2009)
那还用说?
Do I even need to say?
— 朱诺 (2007)
那还用说吗
Do you even need to ask?
— 办公室的故事 (1977)