There are many grammar books available if you want to learn from a text book. This should be supervised by an English language teacher/tutor so that you can pronounce the words correctly. Please refer to my posts on Spoken English and How to improve your English listening skills.
There is a good grammar book called Advanced grammar that an italki member recommends
If you want to learn grammar online, the following links could help you learn English grammar:
September 28, 2012
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