r-controlled ir

Core Rule

"ir" is an r-controlled vowel pattern. When i is followed by r, the original short /ɪ/ is overridden, producing the unified sound /ɜːr/ (American /ɝ/). The vowel quality is reduced, and r controls the sound.

Articulation Guide

Curl the tongue slightly upward toward the alveolar ridge without touching it. Keep the mouth relaxed and slightly open. Maintain steady airflow so the vowel smoothly blends into the r sound.

Word Analysis

• girl /ɡɜːrl/: no /ɪ/ sound remains; ir acts as one unit.
• birth /bɜːrθ/: the r sound dominates the syllable.
• childbirth /ˈtʃaɪldˌbɜːrθ/: note the contrast between child and the r-controlled ir in birth.

Pitfalls

Do not pronounce ir as /ɪr/ or confuse it with "ear" or plain "er" patterns.