Past simple

http://www.english-room.com/pasttense_6a.htm

http://www.englishpage.com/irregularverbs/irregularverbs.html

http://www.englisch-hilfen.de/en/exercises/s_past3.htm

http://www.englisch-hilfen.de/en/exercises/s_past1.htm

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pasted2.htm

www.isabelperez.com/happy/tenses/past_simple.htm

http://www.angelfire.com/wi3/englishcorner/grammar/grammar.html#simpasint