The following website contains information on verb tenses, as well as exercises to practice: http://www.englishpage.com/verbpage/verbtenseintro.html Table of English tenses, with examples, and interactive exercises.
Another website with explanations and exercises: English Tenses
Some other websites to get more practice:
Create as many affirmative sentences in the past as possible using the verbs and phrasal verbs in the word cloud. Try to to make your sentences cpmplete and interesting (add adverbs, adjectives...)
DIRECTIONS: Watch the presentation and practice using the present simple and continuous tenses with the exercises included in the presentation. You can practice some more at http://a4esl.org/q/h/vm/sp_or_pc.html
When you're ready, watch the wideo "Things I'll never say" by Avril Lavigne, and answer the quiz.
If you'd like to do so, you can check out the lyrics at http://www.lyrics.com/
Have fun!