The best way is to read.When you read, you hear how something is said,how words are used,and you learn new vocabulary. My father is an English teacher here in Korea,and he told his students to read at least one article a day at: http://www.voanews.com/specialenglish/ . Each article has a voice clip attached to it.After 3 months his students' English was much much better,and they spoke much better than the other students. So if you read and listen to that one article every day you will definitely see an improvement. And also, create your own English 'world'. Listen to Englsih music,try to make many English friends,and watch alot of movies! :) (But remember,reading is very very important) Hope I could help you! Good luck,you can do it!!:)

I think one of the best ways to learn oral english is to first build vocabulary. To speak to others, you need to know the word you wish to say first. The better your vocabulary, the more smoothly you'll be able to speak. You can learn grammar from reading/writing but need vocabulary to increase the number of ideas you can express. Once you got the vocabulary down pact, try making sentances in your head. Instead of saying in Chinese, 'I am going to be late!' think to yourself in your head in English, 'I am going to be late!' If you keep practicing speaking to yourself every day, you'll improve pretty quickly. I also recommend sometimes while working maybe? listening to an book on tape or cd. That way you can listen to spoken english to practice listening and build vocabulary slowly. Often books on audio tape or cd have very good pronounciation and if there are several 'characters' you'll get to hear several different voices or accents.

The best is to watch Movies or TV-shows, to get a feeling how a language is spoken.

Listen to songs. Watch movies with subtitles and original language. Speak with yourself, not in public, but when you are reading something in English and you encounter a new word. Just say it a couple of times to get a feel for it. :)