study表示书房的复数是什么

复数：studies

n.学习；研究；功课；课业；
v.学习；攻读；审视；端详；细看；研究；调查

第三人称单数：studies
现在分词：studying
过去式：studied
过去分词：studied

例句：
他在书房里潜心研究一些旧材料。
He was in his study labouring away over some old papers.
书房里丑陋的一幕在她脑海中依旧清晰。
The ugly scene in the study was still etched in her mind.
我们到书房听点儿音乐吧。
Let's go into the study and put on some music.