Impossible to say.
The speaker cannot say why.
The person can say whatever it is.
A person is shopping.
The man is wearing clothes.
Train workers eat
Man sitting while snapping peas.
A person in a white coat is standing next to a UPS mailbox.
Kids are learning enough just to get by on tests and then forgetting about it for the rest of school. Both systems need to be taught at the same time, its a lot harder for teachers but its the only way the kids will be able to get switched over.