Subject + 还给 + Recipient + Object
还给 (huángěi) means "to give back" or "to return something to someone." It is a verb compound where 还 means "to return" and 给 indicates the recipient of the returned item.
你借的书看完了记得还给图书馆。
nǐ jiè de shū kàn wán le jì de huán gěi tú shū guǎn.
Remember to return the books you borrowed to the library when you're done.
他终于把钱还给了朋友。
tā zhōng yú bǎ qián huán gěi le péng yǒu.
He finally paid the money back to his friend.
请把钥匙还给房东,我们明天就搬走。
qǐng bǎ yào shi huán gěi fáng dōng, wǒ men míng tiān jiù bān zǒu.
Please return the keys to the landlord — we're moving out tomorrow.