The human vocal tract is capable of producing hundreds of different sounds, only about 44 of which are actually used in English - which may or may not be some of the same sounds as are used in any other language on the planet... As a classroom ESL teacher, I constantly found myself having to teach students how to pronounce the sounds of English (called phonemes, if you want the technical term). I still remember my students raising their eyebrows at my terrible drawings of how to position the tongue in the mouth in order to produce specific sounds. Then I found this website.
This post winds up my series on word sorts and how they can be useful to ELL students in the classroom. The last use that I have for word sorts is to study the more technical aspects of language, something that we need to teach more explicitly for our English learner students in order for them to learn the intricacies of the language.