I don't know why I didn't think of it sooner, because this problem has been bugging me for months, if not years!

我不知道为什么我没有更早地想到它，因为这个问题已经困扰了我几个月了，如果不是几年的话！

youdao

And I bet the reason why you're not pursuing something better is because you don't know what you'd rather do.

而且我认为你不去追求更高目标的原因是因为你不知道什么是更应该做的。

youdao

I don't know why I did that. Perhaps it was nervousness, perhaps it was because, when you get very close, one to another, it is very hard not to smile.

我不知道自己为何有这般反应，也许是过于紧张，或者是当你如此靠近另一个人，你很难不对他微笑。

youdao

"We need an explanation because I don't know why the referee has added that amount of time on, " said Hughes.

BBC: Angry Hughes bemoans timekeeping

Because he told me, 'They are making up such crazy stuff, I don't know ... why they doing it.

CNN: SHARE THIS

That's why I don't actively seek reasons for drawing her, because I know I shall be pulling my punches.

WSJ: Her Maj: 60 Years of Unofficial Portraits of the Queen | Cartoon Museum | Too Gentle on the Queen? | By Richard Holledge