Tā hé nǚpénɡyǒu yìqǐ zhù.
他和女朋友一起住。
He lives with his girl friend.
Notes:
他(tā): he
和(hé): with, and
女朋友(nǚpénɡyǒu): girl friend
一起(yìqǐ): together
住(zhù): to live
Example:
A:他一个人住吗?
Tā yíɡerén zhù mɑ?
Does he live alone?
B:他和女朋友一起住。
Tā hé nǚpénɡyǒu yìqǐ zhù.
He lives with his girl friend.