Explicação com vídeo:past simple negative: https://www.youtube.com/watch?v=wXnDmvBBHHs
Explicação com vídeo: past simple questions: https://www.youtube.com/watch?v=6A9_lVlNYEo
Link 0: https://learningapps.org/3682955
Link 1: http://www.englishlab.net/hp/quiz13_past_simple_5_affirmative_negative.htm
Link 2: http://www.englishexercises.org/makeagame/viewgame.asp?id=7798
Link 4: http://www.englishexercises.org/makeagame/viewgame.asp?id=6001