Questions and negatives

Some exercises:

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_mix.htm
http://www.adelescorner.org/grammar/past_tense/past_regular.html
http://www.kico4u.de/english/uebungen/unregelmaverb/regel1.htm
http://www.isabelperez.com/happy/tenses/exercises/past_mistakes.htm
http://www.isabelperez.com/happy/tenses/exercises/past_quest1.htm

Darwin´s biography

Check the video, that was the listening about.