探究发现
1．In a society where being thin is often seen as being beautiful, teenagers sometimes turn to extreme methods to slim down quickly.
2．It is normal for teenagers to be slightly overweight and there is no reason why they should be worried.
3．They are still growing, and night is the time when their bodies grow faster.
4．Teenagers who do not sleep well may experience situations where body development slows down, and their health suffers.
[我的发现]
(1)句1、4中关系副词where引导定语从句，作地点状语。
(2)句2中关系副词why引导定语从句，作原因状语。
(3)句3中关系副词when引导定语从句，作时间状语。
