past tenses exercises

here is a link to past tenses
http://www.englishpage.com/verbpage/verbs11.htm
http://www.englishpage.com/verbpage/verbs12.htm
 http://www.englishpage.com/verbpage/verbs13.htm
http://www.englishpage.com/verbpage/verbs14.htm
http://www.englishpage.com/verbpage/verbs29practicetest.htm

gerunds and infinitives

Here are some links to gerunds and infinitives exercises. hope it works for you.

http://www.ego4u.com/en/cram-up/grammar/infinitive-gerund

http://www.englisch-hilfen.de/en/exercises_list/gerund_infinitiv.htm

http://www.englishpage.com/gerunds/index.htm