"同事已放工", "同事尚未返到公司" 正確的英文點講?

你可以這樣回答
同事已放工:
He has gone for the day.
He's already left for home today.
He has gone home.
至於"同事尚未返到公司"，可以說：
He is not in now.
He has'nt come to the office yet.

The colleague have quit work,they haven't come to the company.

HE/SHE HAS ALREADY COME OFF WORK.
同事已放工

HE/SHE HAS NOT ARRIVED YET.
同事尚未返到公司