"The boy is sitting on the chair."
Translation:Pojken sitter på stolen.
You use pojke mostly for small children... up to I don't know, 7 maybe? If you're a teenager or young adult you'd refer to yourself and other males as kille. Then it's 'man' when you're a mature adult. If you'd refer to your friends as pojke it would only be in an ironic way I'd say. Same with women but replace the words with the corresponding flicka/tjej/kvinna.