Subject + 服刑 + Duration
服刑 (fúxíng) means "to serve a sentence" or "to do time in prison." It is a formal legal term used to describe the period during which a convicted person carries out their punishment. For example, 他正在服刑 means "he is currently serving his sentence."
他因为抢劫被判入狱,目前正在服刑。
tā yīnwèi qiǎngjié bèi pàn rùyù, mùqián zhèngzài fúxíng.
He was sentenced to prison for robbery and is currently serving his sentence.
服刑期间,他学会了一门手艺。
fúxíng qījiān, tā xuéhuì le yī mén shǒuyì.
During his imprisonment, he learned a trade.
她的丈夫还有三年才能服刑结束。
tā de zhàngfu hái yǒu sān nián cái néng fúxíng jiéshù.
Her husband still has three more years before he finishes serving his sentence.