Present Perfect (I have finished / Has he finished ? / They haven't finished) : is used for experiences we have already have or haven't had yet.
OR : for activities that started time ago and haven't finished yet (already, just, yet, since, for,...)
Past simple: I played / Did he play? / She didn't play : is used for activities we did in the past. They are finished and completed (yesterday, last Monday/week/month/year, when..., in 2000, etc)
