How many diphthongs are there in English?
Here are a couple of sites that explain English diphthongs:
http://www.fonetiks.org/engsou3am.html
http://www.btinternet.com/~ted.power/esl0105.html
http://www.fonetiks.org/engsou3am.html
http://www.btinternet.com/~ted.power/esl0105.html