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1·I don't know why.

我不知道为什么。《柯林斯英汉双解大词典》

2·I don't know why they left, he said dolefully.

“我不知道他们为什么离开，”他悲伤地说。《柯林斯英汉双解大词典》

3·I don't know why I settled on Miami, but anyway I did.

我不知道为什么我落户到了迈阿密，但不管怎样我做了。《柯林斯英汉双解大词典》

4·I don't know why everybody makes such a fuss about a few mosquitoes.

我不知道为什么所有人都为几只蚊子发这么大的牢骚。《柯林斯英汉双解大词典》

5·Ladies, boomed Helena, without a microphone, we all know why we're here tonight.

“女士们”，海伦娜没用话筒朗声说道，“我们都知道今晚我们为什么在这儿。”《柯林斯英汉双解大词典》

6·You all know why I am here, so I won't waste time on preliminaries.

你们都知道我为什么来这儿，因此我就不浪费时间作介绍了。《柯林斯英汉双解大词典》

7·You all know why I am here. So I won't waste time on preliminaries.

你们都知道我为什么在这里。所以我就不浪费时间讲客套话了。《柯林斯英汉双解大词典》

8·I always end up having an argument with her, I don't know why, I just can't help it.

我总是和她意见不合，闹得不欢而散，我不知道为什么，我就是忍不住。《牛津词典》

9·I don't know why the guy yelled at me. And as for going back there, certainly I would never go back, for fear of receiving further abuse.

我不知道为什么这个家伙冲我吼叫。至于回到那儿去，我肯定永远也不会回去了，生怕遭到更多的虐待。《柯林斯英汉双解大词典》

10·I know you did it—I just want to know why.

我知道这是你干的，我只是想知道为什么。《牛津词典》