Constantly complain about how you never get to join in any of the reindeer games.
问题描述：
Constantly complain about how you never get to join in any of the reindeer games.
为什么用HOW ,它做什么成分,
答
可以用how,带有”你怎么能这样（即从不参加驯鹿游戏）呢”的抱怨意味.
how在这里作连接副词,连接宾语从句.