Americans pronounce "It's smoother than the other one" as "ihts SMOO-dher dhuhn dhee UH-dher wuhn" in casual speech. Several things bend the textbook pronunciation. The headline is the Same-Consonant Linking — the doubled consonant is held once, not pronounced twice. It lands on it's, 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.
Pronouncing the identical consonant twice.
The "s" shared between "it's" and "smoother" is held once, slightly longer, and released once instead of stopping and starting twice. Consonant is held slightly longer and released once (not said twice).
Leaving a gap between two vowels.
Between "the" and "other", 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 "it's" vanishes — the "ih" 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.