你为什么不做点什么改变局面呢？

Why don't you do something to change the situation?

youdao

你为什么做这个？你为什么不做那行？

Why did you do this? Why didn't you do that?

youdao

你为什么不做做健美呢？

Why don't you do some body-building?

youdao

But, you know why not do something a little special, little different, and they decided instead to use lithium.

但是你懂的，为什么不做的更特殊，更与众不同一些呢？

麻省理工公开课 - 化学原理课程节选

But when you asked them why they didn't try it the answers tended to be "I would look silly."

但当你问他们为什么不尝试时,他们的答案往往是“这样做会很傻”

耶鲁公开课 - 心理学导论课程节选