oi/oy vowel
Rule Core
oi/oy represents the diphthong /ɔɪ/. General rule: oi appears in the middle or beginning of words, while oy usually appears at the end. Same sound, different spelling positions.
Articulation Guide
Start with /ɔ/: back of the tongue slightly raised, lips rounded. Glide quickly to /ɪ/: tongue moves forward, lips relax. Airflow stays smooth.
Word Analysis
annoy (/əˈnɔɪ/): final-position oy; avoidance (/əˈvɔɪdəns/): medial oi; disappointing (/ˌdɪsəˈpɔɪntɪŋ/): stressed oi is clearly heard.
Pitfalls
Do not confuse /ɔɪ/ with /oʊ/ or /aɪ/. Avoid spelling oy at word endings as oi.
Phonics Breakdown
Start rounded /ɔ/, then glide quickly to /ɪ/ with continuous airflow.
Sound Reference
- Use position to choose oi vs oy
- Practice a clear glide from /ɔ/ to /ɪ/
Common Mistakes
Reading /ɔɪ/ as /oʊ/
Using oi at word endings