[header] How to improve written english [title] Read books written in english. [step] Books and magazines can introduce you to new words, provided you pay attention to the words and look up the ones you don't know rather than skipping over them. [substeps] Keep a dictionary nearby when you're reading, and look up any word you don't know. 
Read the whole definition for the word, and think about how the author is using it in context. Make a running list of words you encounter as you read.