victory two steps:one must do one's work well 中的do 为什么不加es?

one must do one's work well 中的do 为什么不加es? try one's best 与do one's best的区别 donate one's time to do 还是to doing? what is hard to do good in all one's life and never do bad. Do you have one healthy h-----?? DO YOU KNOW THE ONE ? 是什么意思？ do that to me one more time which one do you choose? Why? take one's turn to do 与 take one's turn doing "的区别" One must have sth. to belive in .寻帮翻译