In casual American English, "She said yes" sounds like "shee sehd yehs". Two things happen here, and the headline one is the Y-Merging (gotcha, didja): the T/D/S/Z fuses with the following Y into CH or J. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
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What makes this sentence sound American.
The "" at the end of "said" and the "y" starting "yes" blend together into "" — natural in casual conversation; in formal or careful speech, the two sounds stay separate. This is called the Y-Merging (gotcha, didja), how Americans glue words together so they sound like one phrase. It comes out as sehd.
What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Saying the consonants separately.
The "" at the end of "" and the "y" starting "" blend together into "" — natural in casual conversation; in formal or careful speech, the two sounds stay separate. The two sounds merge: T+Y → CH, D+Y → J, S+Y → SH, Z+Y → ZH.
Pronouncing the function word too fully.
"she" is a function word — in connected speech, the full vowel reduces to a quick "" sound and consonants may simplify. Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.