In casual American English, "Could you close the curtain, please?" sounds like "kuud yuh KLOHZ dhuh KUR-tuhn PLEEZ". Several things happen here, and the headline one is the Glottal T: the T closes off into a tiny silent pause instead of a clean release. 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.
In "curtain", the "t" before the syllabic nasal becomes a glottal stop — a catch in the throat where the schwa drops and the nasal becomes syllabic. This is called the Glottal T, and it's one of the defining features of casual American English. It comes out as KUR-tuhn.
What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
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Each word has its own page with examples, common mistakes, and related words.
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Releasing the T before the syllabic N.
In "curtain", the "t" before the syllabic nasal becomes a glottal stop — a catch in the throat where the schwa drops and the nasal becomes syllabic. /t/ becomes a glottal stop [ʔ] — a catch in the throat. The schwa in the following syllable is dropped, making the nasal syllabic.
Inserting a vowel before the syllabic consonant.
In "curtain", the short unstressed vowel before "" disappears — the schwa is absorbed and the "" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
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.
"could" 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.