When are FOR, SINCE and AGO used?

Find some exercises here

Phonetics and Phonology

Great links for the study of phonetics and phonology

http://www.uiowa.edu/~acadtech/phonetics/english/frameset.html


And the English Phonetic Transcription Convertor:

http://project-modelino.com/english-phonetic-transcription-converter.php?site_Xlanguage=english

Check your pronunciation at http://www.howjsay.com/