Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.

Americans pronounce themes as THEEMZ (/θimz/). You'll hear it in sentences like "The novel explores themes of love, loss, and redemption" or "She explores themes of nature and identity in her artwork" — more examples below.
Record yourself saying "themes" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 4 sounds. Explore each sound's mouth shape and how it's made.
Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.

Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.

Press your lips together. Air flows through your nose. Vocal cords vibrate.

Same position as S, but add vocal cord vibration. Feel the buzz.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.