why

1. QUEST You use why in questions when you ask about the reasons for something. 为什么 (用于提问原因)

Why hasn't he brought the whiskey?

为什么他还没把威士忌酒带来？

Why didn't he stop me?

为什么他没有阻止我？

2. CONJ You use why at the beginning of a clause in which you talk about the reasons for something. …的原因 (用在从句开头)

He still could not throw any further light on why the lift could have become jammed. 他对电梯为什么会卡住仍给不出更多解释。

Experts wonder why the U.S. government is not taking similarly strong actions against AIDS in this country. 专家们想弄明白为什么美国政府没有对该国的艾滋病采取类似的强硬举措。

3. ADV Why is also an adverb. 为什么

I don't know why. 我不知道为什么。

It's obvious why. 很明显是为什么。

4. PRON-REL You use why to introduce a relative clause after the word "reason." 用在(reason)后面，引导关系从句

There's a reason why women don't read this stuff; it's not funny. 妇女们不读这种东西是有原因的：它并不逗趣。

5. ADV Why is also an adverb. 为什么[n ADV]

He confirmed that the city had been closed to foreigners, but gave no reason why. 他证实这座城市已经禁止外国人进入，但没有给出原因。

6. QUEST You use why with "not" in questions in order to introduce a suggestion. (问句中与)(not)(连用，引入建议) 为什么

Why not give Charmaine a call?

为什么不给莎梅因打个电话呢？

7. QUEST You use why with "not" in questions in order to express your annoyance or anger. (在问句中与)(not)(连用，表达懊恼或愤怒) 为什么[情感]

Why don't you look where you're going?

为什么你不看看自己在往哪儿走？

8. CONVENTION You say why not in order to agree with what someone has suggested. (表示赞同某人的建议) 为什么不呢[套语]

"Want to spend the afternoon with me?"—"Why not?"

“想和我一起度过这个下午吗？”—“为什么不呢？”

9. INTERJ People say "Why!" at the beginning of a sentence when they are surprised, shocked, or angry. (用于句首表达惊讶、震惊或愤怒) 哎呀 ！[美国英语]

Why hello, Tom. 哎呀，你好，汤姆。