Past Simple vs Present Perfect
Past simple (yesterday, last night, in 1945 )
Bevestigend - ww+ed of tweede rijtje
Ontkennend - Onderwerp + didn't + hele werkwoord.
Vragend - Did + onderwerp + hele werkwoord?
Present perfect (since, for, never, started in the past, but still continues)
have/haven't + ww+ed of derde rijtje