I like to instant message or text with native speakers. You imitate their grammar and learn reading and writing that way. It's ok to make mistakes, but always learn from a native speaker when they correct you.

Hello Caicai: I would recommend that you start with a study of the "Parts of Speech" A quick web search shows the following lings and also some graphic images to help and guide you. http://search.yahoo.com/search?fr=mcafee&type=A010US0&p=%22Parts+of+Speech%22 Also, it may help, at least at first, to use the Dolch List for the most common words used in the English language, to simplify your studies. Also, to be a little more specific, I am including one specific link taken from that previous search, so that you might have at least a basic starting point. Use the Answers forum here and ask as many questions as you like until you feel that you have a solid foundation upon which to base your study.