The Color Vowel Chart is an excellent visual tool that you can use to learn or TEACH the 15 vowels sounds in North American English.
The hard copies of the chart are really nice; colorful and laminated with color words and IPA symbols. There are teaching activities you can use on the back of the chart.
The online version has audio. I use both the hard copies and the online version with my accent reduction clients. The chart helps them articulate and remember their problem vowel sounds.
American English pronunciation teachers can order the poster to hang in their office or classroom.
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