I’ve recently found a new site that has some wonderful interactive books that help you learn verb tenses and other English topics.
The website, Let’s Have Fun with English, is hosted by Mrs. Haquet, a British teacher, so there is a bit of a British (UK) feel to the spelling and grammar but the American (US) version is also given. Here are the current Interactive books.
Be sure to try out the interactive vocabulary exercises too!
The link to this website can always be found on under English Lesson Online, More English Online page.