Tired of waiting, he told the ground crew: "Why don't you fellows solve your little problems and light this candle."

VOA: special.2009.06.17

And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

But for me, I like to look at something and just say, "I like this. I don't really know why though."

但对我来说，我喜欢看着某个东西，然后说，“我喜欢这个。但我也不知道为什么。”

关于现代美术 - SpeakingMax英语口语达人

Don't know why I ever thought I needed, don't know why I thought I needed, don't know why I ever thought I needed you.

NPR: Dustbin Bands: The Surreal McCoys

So George Mason, when you hear people saying, well, why don't we do this more incrementally, why don't we do this a little more piecemeal, why don't we just help the folks that are easiest to help -- my answer is the time for reform is now.

WHITEHOUSE: The Time for Health Reform Is Now

And I'm sure you will be hearing about these impacts from Americans themselves who will wonder why Republicans made this choice, why they wouldn't go along with what they did two months ago, why they wouldn't go along with balanced deficit reduction, why they chose protecting tax loopholes for the few rather than protecting the jobs of the many or protecting our economy.

WHITEHOUSE: Press Briefing