JJ sound in 'Could You?' -- American English Pronunciation

The video tutorial explains the occurrence of j and ch sounds in American English when the word 'you' follows a T or D sound. It provides examples like 'could you' and 'want you' to illustrate how these sounds blend due to mouth positioning. The tutorial also discusses the difference between casual and formal pronunciation, emphasizing that while separate D and Y sounds are correct, the blended sounds are common in casual speech. The video concludes with additional examples to clarify these concepts.

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