Bij vraagzinnen
Past simple -> did + hele ww, behalve bij am/are/is/have/has/can/must
Present perfect -> have/has + onderwerp + vd
Bij ontkenningen
Past simple -> didn't + hele ww, behalve bij am not/aren't/isn't/haven't/hasn't/can't/mustn't
Present perfect -> onderwerp + haven't/hasn't + vd