n. the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'
adv. 为什么
n. 原因, 理由
1. Why are you late for school?
你为什么上学迟到了？
2. Do you know why she is upset?
你知道她为什么不高兴吗？
3. Why did you choose this book?
你为什么选择这本书？