Why
We don’t know the reason why he didn’t show up. 我们不知道他为什么没有来。
She didn’t tell me the reason why she refused the offer. 她没跟我讲她拒绝这项工作的原因。
When
There comes a time when you have to make a choice. 你必须作出抉择的时候到了。
We’ll put off the picnic until next week, when the weather may be better. 我们将把野餐推迟到下星期,那时天气可能会好一点。
Where
This is the village where he was born. 这就是他出生的村子。
That’s the hotel where we were staying last summer. 这就是我们去年夏天住的旅馆。
参考资料:百度百科
如有疑问,请追问。
无疑后请采纳。
书山有路勤为径,学海无涯苦作舟。
-----------与君共勉-----------