Enzymes act as catalysts to speed up chemical reactions in the body.

Words 12 Difficulty Advanced Featured sound Flap T
EHN·zahymz enzymes AKT act uhz as KA·duh·luhsts catalysts tuh to SPEED speed UHP up KEH·muh·kuhl chemical ree·AK·shuhnz reactions ihn in dhuh the BAH·dee body
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In casual American English, "Enzymes act as catalysts to speed up chemical reactions in the body" sounds like "EHN-zahymz AKT uhz KA-duh-luhsts tuh SPEED UHP KEH-muh-kuhl ree-AK-shuhnz ihn dhuh BAH-dee". Several things happen here, and the headline one is the Flap T: the T between vowels turns into a quick D-like flap. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.

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Common mistakes

Pronouncing the T in a consonant cluster.

In "catalysts", the "t" is squeezed between other consonants and drops out — the surrounding consonants flow together without it — most natural in flowing, casual speech; in careful or formal speech, the T may be lightly present. /t/ is dropped entirely — the surrounding consonants flow together without the T.

Saying a hard "T" in the middle.

In "catalysts", the "t" 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.

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Why it sounds different

What makes this sentence sound American.

In "catalysts", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, and it's one of the defining features of casual American English. It comes out as KA-duh-luhsts.

The breakdown

What's happening in this sentence.

Small tricks that turn a textbook sentence into how an American actually says it.

⌣
Consonant-to-Vowel Linking between "enzymes" & "act"Final consonant "migrates" to next word — no pause between.
•
Unreleased Stops in "act"Air stops but there's no release burst — the articulators hold position.
t→ɾ
Flap T in "catalysts"In "catalysts", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth.
t→∅
Silent T in Clusters in "catalysts"In "catalysts", the "t" is squeezed between other consonants and drops out — the surrounding consonants flow together without it — most natural in flowing, casual speech; in careful or formal speech, the T may be lightly present.
·
Reduced Words (to, for, of) in "to"Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.
ɾ
Flap T Across Words between "speed" & "up"The "t" at the end of "speed" links to the vowel starting "up" — it flaps to sound like a quick "d", with the tongue briefly tapping the ridge behind the upper teeth.
Word by word

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Each word has its own page with examples, common mistakes, and related words.

enzymes EHN·zahymz act AKT as uhz catalysts KA·duh·luhsts to tuh speed SPEED up UHP chemical KEH·muh·kuhl reactions ree·AK·shuhnz in ihn the dhuh body BAH·dee
Watch out

Common pronunciation mistakes in American English.

The textbook way isn't wrong — it's just not how anyone actually says it.

01

Pronouncing the T in a consonant cluster.

In "catalysts", the "t" is squeezed between other consonants and drops out — the surrounding consonants flow together without it — most natural in flowing, casual speech; in careful or formal speech, the T may be lightly present. /t/ is dropped entirely — the surrounding consonants flow together without the T.

KA-duh-luhsts→KA·duh·luhsts
02

Saying a hard "T" in the middle.

In "catalysts", the "t" 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.

KA-tuh-luhsts→KA·duh·luhsts
03

Treating every L the same.

The L in "chemical" 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.

KEH-muh-kuhl→KEH·muh·kuhl
04

Releasing the final consonant with a puff of air.

In "act", the "" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.

AKT→AKT
Questions

Questions people ask about this.

Why do the T sounds turn into D-like sounds in this sentence?
That's the flap-T rule: when /t/ sits between two vowels — inside a single word, or across the boundary between two words — Americans replace the crisp T with a quick D-like flap. It's one of the most distinctive sounds of casual American speech and one of the first things to copy if you want to sound less textbook.
Why is "to" said so quickly in this sentence?
Function words — articles, prepositions, auxiliaries, pronouns — reduce to short, unstressed schwa shapes in casual American speech. Pronouncing them fully like the dictionary entry is a dead giveaway of a textbook accent. Native speakers stress only the content words and let everything else collapse.
How are the words connected in casual American speech?
Americans don't pause between words. A consonant at the end of one word links forward into the vowel that starts the next; two vowels in a row get bridged by a tiny W or Y glide; an identical consonant repeated across a word boundary is held just once. The result is a continuous flow rather than a textbook word-by-word delivery.
Is this how the sentence is taught in textbooks?
Textbooks usually teach the citation form — every word pronounced fully, every consonant crisp, every vowel pure. Americans actually flap their Ts, drop function-word H's, link consonants forward into vowels, and reduce unstressed syllables to schwa. The respell on this page shows the casual form you'll hear in real conversations rather than the textbook version.

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