http://www.englishgrammarsecrets.com/
I do recommend this page because it has several topics for you to practice. You click on the topic you are interested and you get a short explanation about that subject, and links to some exercises at the end.
http://www.englishpage.com/verbpage/verbtenseintro.html
This is a verb tense tutorial. You have many exercises and at the end you can click on the different examples of the tenses and get explanations of them.
Present Simple
Past Simple
Present perfect
Past continuous
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