Speak with English speakers as much as possible. Join an informal conversation class or set one up yourself. Total immersion, even for just an hour a week, can improve fluency and comprehension.
Pay for one-to-one conversation lessons with a native English speaker. Focus on the pronunciation of words and encourage corrections by the tutor. Pick interesting topics and spend most of the session talking and listening, rather than reading and writing.
Speak with yourself to improve your spoken English. With this method, you are practicing the sounds aloud.
Take an online course with a native English speaker. With access to broadband and a headset and web cam, foreigners can connect to English speakers around the world. It is a good alternative to a face-to-face conversation class.
Buy specialist software, such as NativeAccent, and speech assessment software. This software acts as a tutor and will correct your accent and mistakes with speech.
Study with a book that comes with an audio program. The programs usually provide plenty of opportunities for the foreign student to listen to English and then repeat the sentences and idiomatic phrases.
Visit an English-speaking country if possible to take a language course for a week or two. Or spend some time with a host family in the country to practice speaking the language.