work at = to practice; to develop a skill
Tanya is working at becoming a better singer.
work (something) into = to bring someting into a larger group.
We don’t have a lot of extra time today, but we’ll have to work this meeting into our schedule.
work out = to fix something; to solve a problem.
We need to work out a solution to this problem.
work out = to execise; to exercise with heavy weights.
You can tell that Jim has been working out lately. He’s getting huge.
work over = to create pain and suffering for another person
The interrogators worked the man over until he gave a confession.
work through = to continue despite difficulty
A therapist is helping the couple work through their marital problems.
work up = to create; to develop
I’ve really worked up an appetite after playing football all morning.
We have to work up a new plan because our other plan was rejected.