In casual American English, "I'll let you know my decision tomorrow" sounds like "ahyl LEHT yuh NOH mahy duh-SIH-zhuhn tuh-MAH-roh". Several things happen here, and the headline one is the Silent Schwa Before L/M/N/R: the unstressed vowel disappears and the consonant becomes its own syllable. 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 "decision", the short unstressed vowel before "" disappears — the schwa is absorbed and the "" becomes the syllable nucleus on its own. This is called the Silent Schwa Before L/M/N/R, the kind of sound shift that makes everyday speech feel effortless. It comes out as duh-SIH-zhuhn.
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.
Treating every L the same.
The L in "i'll" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. Dark L adds a small schwa-like "uh" before the L. The back of the tongue lifts toward the soft palate.
Inserting a vowel before the syllabic consonant.
In "decision", 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 identical consonant twice.
The "" shared between "" and "" 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).
Questions people ask about this.
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