I just learned a new sentence:
"De niño, yo dormía mucho." (As a child, I used to sleep a lot)
I would like to know:
(1) How to say "As a child, Tommy learns by playing games"?
(2) How to say "Since a child, Tommy has been learning by doing things"?
(3) How to say "When Tommy was a child, he was very playful"?
(4) When to use "de" or "como"?
(5) Is it always unnecessary to use "un/una" when I say "As a child/student/parent, ..." ?