Americans pronounce "The interest rate on my mortgage is fixed for the next thirty years" as "dhee IHN-tuh-ruhst RAYT ahn mahy MOR-guhj uhz FIHKST fer dhuh NEHKST THUR-dee YEERZ" in casual speech. Several things bend the textbook pronunciation. The headline is the Silent T after N — the T after N drops out entirely. It lands on interest, and it's one of the defining features of casual American English. 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 silent T after N.
In "interest", the "t" right after N is dropped — the tongue skips the T stop and moves directly from the N position to the next sound. /t/ is completely silent — the tongue skips the T stop and moves directly from the N position to the next sound.
Saying a hard "T" in the middle.
In "thirty", the "d" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.
Hard T at the end of a word, not a flap.
The "t" at the end of "rate" 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.
Pausing between the words.
The "j" at the end of "mortgage" flows directly into the vowel starting "is" — the consonant migrates to the next word with no pause between. Final consonant "migrates" to next word — no pause between.