/waɪ; [US] hwaɪ; hwaɪ/
interrog adv
1 for what reason or purpose 为什么原因或目的
*Why were you late? 你为什么迟到?
* Why did you buy a spade? 你买铁　干什么?
* Tell me why you did it. 告诉我你为什么干那件事?
* Do you know why the door is locked? 你知道不知道门为什么锁上了?
2 (used in front of a v to suggest that sth is unacceptable or unnecessary 用于动词前表示某事不可取或不必要)
*Why get upset just because you got a bad mark? 何必因为得的分数差就想不开?
* Why bother to write? We'll see him tomorrow. 还写信干什么? 我们明天就见到他了.
3 (idm 习语) why ever (used to express surprise 用以表示惊讶) why （究竟）为什么, 怎么
*Why ever didn't you tell us before? 你怎么不早告诉我们呢? why not (used to make or agree to a suggestion用以提出一建议或对一建议表示同意)
*Why not go now?现在就去好不好?
* `Let's go to the cinema.' `Why not?' ｀咱们去看电影吧.＇｀好哇.＇

rel adv 关系副词 (used esp after reason 尤用于 reason 一词之後) for which (reason) 因此（原因）
*the reason why he left her 他离开她的原因
* That is (the reason) why I came early. 这就是我来早了的原因.

interj (expressing surprise, impatience, etc 用以表示惊讶、不耐烦等)
*Why, it's you! 呦, 是你呀!
* Why, it's easy a child could do it! 　, 这很容易--连孩子都会!

n (idm 习语) the whys and (the) wherefores the reasons 原因; 缘故; 理由
*I don't need to hear all the whys and the wherefores, I just want to know what happened. 我无需听那些大道理, 我只想知道是怎么了.