List of irregular verbs and Verbtenses

Irregluar Verbs
https://www.englishclub.com/vocabulary/irregular-verbs-list.htm

Verbtenses Overview with examples
https://www.ego4u.com/en/cram-up/grammar/tenses

Exercises
http://www.agendaweb.org/verbs/all-english-verb-tenses.html

Verbtenses
http://www.englishpage.com/verbpage/verbtenseintro.html