Americans pronounce "Don't forget to put on your sunglasses" as "DOHNT fer-GEHT tuh PUUT ahn yer SUHN-gla-suhz" in casual speech. Several things bend the textbook pronunciation. The headline is the Flap T Across Words — the T at the end of one word flaps into the vowel that starts the next. It lands on put, 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.
Hard T at the end of a word, not a flap.
The "t" at the end of "put" 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 identical consonant twice.
The "t" shared between "forget" and "to" 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).
Pronouncing every consonant in the cluster.
The "t" at the end of "don't" is dropped before the consonant starting "forget" — the surrounding consonants flow directly together — common in flowing natural speech; in careful or formal speech, the sound is often kept. The /t/ or /d/ at the end is dropped — surrounding consonants flow directly.
Pronouncing the function word too fully.
"to" is a function word — in connected speech, the full vowel reduces to a quick "tuh" sound and consonants may simplify. Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.