look at this video https://www.youtube.com/watch?v=mjYVGAKQMdI
It said that to pronounce /aɪ/, we need to glide from /ɑ/ to /i/
In the above video, they don't teach /a/ sound but only /ɑ/ sound
Anything wrong with this video?
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Yes, there is something wrong. The video is confusing. For clarity, we ought to distinguish sounds, customarily written with brackets, from phonemes, customarily written with slashes. I think that what is meant is that to pronounce the phoneme /aɪ/, we need to glide from the sound [ɑ] to the sound [i]. I'm not sure that is true, really, but I think it is what is meant. The representation of phonemes is to some extent conventional and does not need to correspond directly to pronunciation. The phoneme /aɪ/ is not made up of phonemes /a/ and /ɪ/.