If you can get English TV, watch it , and repeat what they say. Also if you can get tapes or CD's of people speaking in English, listen to those and repeat. The more you pactice, the more it will help you.
The only way to improve is to practice as much as you possibly can. If you live in an area where English speaking people are, talk to them and ask them to correct you if you say a word incorrectly.
Good luck with it. :)