the answer you're looking for is right before your eyes. to be able to speak/write/understand English, you need to practice it everyday. hitarunner and deewho were both correct on their advises. you might also try speaking in front of a mirror,not only to enhance your communication skills, but your confidence as well. good luck!

-Read English texts and listen to native speakers in movies/shows/radio stations as much as you can. Find material that interests you so you'll be more motivated to understand it. Keep a dictionary at hand. -Find a language partner who won't feel bad about correcting your grammar. -Plan for and dedicate time specifically for English (doesn't matter if it's a little everyday, the effects of practice are cumulative).

The best way would be to watch television in English if you are unable to interact with English speakers. You should watch television with subtitles in your native language first and then without the subtitles.