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

"We don't know why the switch failed and why the back-up didn't function as it should, " said Mr Lazaridis.

BBC: Blackberry says services 'fully restored'