Be careful: It's didn't + infinitive
example: I didn't go come. I went to a friend.
Have fun with the exercises!
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=4&level=1&type=negative
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=2&type=negative
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=3&type=negative
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=4&type=negative
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences2.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences3.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=6075
