http://www.bastrimbos.com/Hotpotatoesfiles/spresvraag2.htm
http://englishmaven.org/HP6/Present%20Tense%20Exercise%202.htm
http://www.montsemorales.com/gramatica/PresSimpNeg1Spt.htm
http://www.english-room.com/dodoes_5.htm

http://learnenglishkids.britishcouncil.org/en/short-stories/my-dad?destination=node%2F1610