read a lot--doesn't need to be books--magazines and comics will do. watch movies and/or tv series. this will help you be familiar with grammar, and how the writer or the characters (comics) express their thoughts and ideas. if you encounter words that are not familiar to you, look it up in the dictionary. updating your vocabulary and learning new words will eventually help you in expressing your thoughts into words. and above all, practice your english by actually conversing utilizing this language and also, writing helps a lot.