R-controlled vowels: ar, or, and er
When the letter r comes right after a vowel, it changes the vowel's sound, and the two blend into one new sound called an r-controlled vowel. The letters ar spell the sound in car, or spells the sound in for, and er spells the sound in her; ir and ur often spell that same sound too, as in bird and fur. Reading these letter pairs as one sound, not a short vowel followed by r, helps you decode words like farm, horn, and fern.
This explanation is AI-generated and can occasionally be wrong.
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