Americans pronounce "Let's turn on the air conditioner" as "LEHTS TURN AHN dhee AIR kuhn-DIH-shuh-ner" in casual speech. Several things bend the textbook pronunciation. The headline is the Consonant-to-Vowel Linking — the consonant links forward into the next vowel without a pause. It lands on turn, a connected-speech trick that makes phrases flow. 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.
Pausing between the words.
The "n" at the end of "turn" flows directly into the vowel starting "on" — the consonant migrates to the next word with no pause between. Final consonant "migrates" to next word — no pause between.
Leaving a gap between two vowels.
Between "the" and "air", a brief "y" glide bridges the two vowels for smooth flow. A brief glide (y or w) bridges two vowels for smooth flow.
Pronouncing the function word too fully.
"the" is a function word — in connected speech, the full vowel reduces to a quick "dhee" sound and consonants may simplify. Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.
Pronouncing the vowel inside the contraction.
In fast speech, the vowel in "let's" vanishes — the "eh" is completely elided, leaving only a quick "ts" cluster — this is a feature of casual, connected speech; in careful speech, the vowel is retained. In single-syllable -ts contractions (it's = it + is, that's = that + is, what's = what + is, let's = let + us), the unstressed vowel of the enclitic ("is" /ɪ/ or "us" /ə/) is completely elided in fast speech, leaving only the final /ts/ cluster.