Thanks for your comment, Fatemeh! You asked for my textbook, so I'm uploading a copy here as a PDF so anyone else can download it too. It's almost 300 pages long.
The book is for Canadian students, and the focus is mostly on business writing. But it also has a lot of material on English basics, with some exercises. The answers to the exercises are in the back of the book. Please feel free to pass the book along to anyone else who might find it useful.
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