 He walked on briskly, watching for signs of life and speculating on the principles of applied semantics, name magic and similarity.
He was watching to see if he could find any signs of life.
He walked slowly, making his way among the crowd and thinking about his dinner.
I've never heard worse than that before.
the man is babysitting the crowd
some women standing in a park
This is not a usual case.
A person tries to push a car.
A girl learns to drive.