Americans pronounce "Is that your jacket on the chair?" as "ihz DHAT yer JA-kuht ahn dhuh CHAIR" in casual speech. Several things bend the textbook pronunciation. The headline is the Y-Merging (gotcha, didja) — the T/D/S/Z fuses with the following Y into CH or J. It lands on that, what turns word-by-word reading into actual conversation. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
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What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Hard T at the end of a word, not a flap.
The "t" at the end of "jacket" links to the vowel starting "on" — it flaps to sound like a quick "d", with the tongue briefly tapping the ridge behind the upper teeth. Same flap as within-word (R1) but spanning two words.
Pronouncing the function word too fully.
"is" is a function word — in connected speech, the full vowel reduces to a quick "ihz" sound and consonants may simplify. Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.
Saying a clean TH.
The TH in "that" can be produced with the tongue tip pressing just behind the upper teeth rather than coming all the way through — an easier, faster articulation. Tongue tip presses behind teeth instead of coming through (easier articulation).