Он не чувствовал себя достаточно хорошо , чтобы работать. Никто не мог заставить его уйти, но он сам сожалел, что пришел. Но потом он извинился перед коллегами, за то, что не закончил работу и ушел.
He did not feel well enough to work. No one could force him to leave, but he regretted that came. But then he apologized to colleagues for not having finished the job and left.
He did not feel well enough to work. No one could force him to leave, but he was sorry that he came. Then he apologized to colleagues for what has not finished the work and left.
He did not feel well enough to work. No one could force him to leave, but he himself lamented that came in. But then he apologized to colleagues, for the fact that the work is not completed and resigned.