Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
How to pronounce affects in American English
Americans pronounce affects as uh-FEHKTS (/əˈfɛkts/). In "affects", 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. This is called the Silent T in Clusters, a small move that separates 'classroom' from 'native'. It comes out as uh·FEHKTS. Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "Pollution in the river affects the local fish population".
Now you try.
Record yourself saying "affects" and play it back. The mic stays on your device — nothing's uploaded.
Every sound in "affects".
2 syllables, 6 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.

Drop your jaw moderately. Touch the tongue tip behind the bottom front teeth and lift the mid-front part slightly toward the roof.

Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.

The T is skipped entirely. Your tongue doesn't make contact at the T position.

Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

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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 T in a consonant cluster.
In "affects", 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.
Releasing the final consonant with a puff of air.
In "affects", the "t" 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.
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch FEHKTS — keep everything else short and quick.
Pronouncing the first syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.

