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LibriVox.org is a great website in my opinion. It doesn't offer lessons, but it has a huge variety of audio books. Next time you want to read a book, try listening to the audio version while reading it. It will help with pronunciation. You can also help others by uploading your own reading of a book or a novel.
You can find some here:
http://www.openculture.com/free_english_lessons
Youtube is a good source too.
Unfortunately I can not mention sites; the issue is outside my concern, and I believe in creating my own audio lessons and present them for the students in the class. That was what I was doing; now I'm not working as a teacher.
English Easy Learning. Click on the link. It's vary useful for elementary levels.
Randall's ESL cyber listening lab
http://www.esl-lab.com/
https://www.youtube.com/watch?v=hE7tTq4YZJ8
The above-mentioned website is effective.
I agree with experts
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The best I know is RosettaStone.com, but that may be a paid service. They have all types of (audio and visual) materials for all ages, and in different world languages!
i don't know actually a specific one u can start searching on google lessons for beginners