a) people didn't play computer games.
b) people didn't listen to pop music.
c) people didn't drive cars.
d) people didn't eat hamburgers.
e) people didn't have television.
f) people didn't wear jeans.
Past Simple имеет 3 вспомогательных слова Did/Was/Were. Was/Were - был/была/были../.../...
Что бы сделать отрицание: вспомогательное слово + первая форма глагола.