s sound rule

Rule Core

The S Sound Rule explains how the letter s can represent /s/, /z/, or in specific patterns /ʒ/. The sound depends on position, surrounding letters, and morphological structure.

Articulation Guide

/s/: tongue near the alveolar ridge, steady airflow, no voicing. /z/: same position with vocal cord vibration. /ʒ/: slightly raised tongue, softer friction, often in -sure or -sion forms.

Word Analysis

gesture: in the -sure pattern, s shifts to /ʒ/. saint: word-initial s before a vowel keeps /s/. seam: s + vowel team maintains the clear /s/ sound.

Pitfall Alerts

Do not force /s/ in -sure words; watch intervocalic s turning into /z*; spelling alone is not a reliable predictor of sound.