Go down to business. 言归正传。
None of my business. 不关我事。
It doesn't work. 不管用。
I'm not going. 我不去了。
Does it serve your purpose？ 对你有用吗？
I don't care. 我不在乎。
Not so bad. 不错。
No way! 不可能！
Don't flatter me. 过奖了。
Your are welcome. 你太客气了
