Student or Learner
There was a noticeable touch of pride in the way the old cleaning man seemed to be doing things--cleaning the windscreen, then standing back to admire it; scrubbing the wheels and again, standing back to see what they looked like after the scrub.
It was a lesson to learn, I felt. At no age need one have to beg for a living if one has good health and is willing to work hard. For a while I felt ashamed of myself. Young as I am--just sixteen, and there was this old man who must have been usefully engaged perhaps before the sun appeared above the horizon.
What does "usefully engaged" mean" ? Is it a common expression or collocation?
It means he was doing something useful with his time. Yes, it's common in BrE.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.