these are the sounds found in most native English dialects:
there are also sounds not on the chart
labio-velar voiced central approximant
/w/
vowels, and some consonants such as "r", vary widely by geographical
and social group
5 diphthongs. May use vowels not otherwise used.
(from: Ladefoged, Peter. 1993. A Course in Phonetics. Orlando, Fla.: Harcourt Brace Jovanovich, Inc.)