在 + 书房 + Verb Phrase
The noun 书房 (shūfáng) means 'study' or 'study room,' a room in a house used for reading, writing, or working. It is a common word in both everyday and literary Chinese. 书房 often appears with location words like 在 to indicate where something takes place.
他每天晚上都在书房里看书到很晚。
tā měitiān wǎnshàng dōu zài shūfáng lǐ kànshū dào hěn wǎn.
He reads in his study until very late every evening.
爷爷的书房里摆满了古籍和字画。
yéye de shūfáng lǐ bǎi mǎn le gǔjí hé zìhuà.
Grandpa's study is filled with ancient books and calligraphy paintings.
她把书房整理得干干净净的。
tā bǎ shūfáng zhěnglǐ de gāngānjìngjìng de.
She tidied the study until it was spotlessly clean.