English Banana.com's Big Grammar Book
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Full user review
simple, clear layout, fun tasks, steady progression of grammar & vocabulary, and it's, above all, free!
nothing (except I'd like it to be even longer :)
Excellent source for English worksheets! Easy and quick to use (just select pages you want and print them out). I use Big Grammar Book in ESL one-on-one tutoring classes and it's been a great help to me, and the source of fun practice for my young students.
Even if I don't find a suitable task vocabulary or grammar wise, I often find inspiration to create my own, similar tasks (suitable to the lessons I teach).