Read words with the r-controlled vowel pattern ar, hearing that the r changes the vowel sound completely.
When a vowel is followed by the letter r, the r takes over and changes the vowel sound completely. It is not short and not long -- it is a whole new sound. This is called an r-controlled vowel.
Ar says "ar," like in car, star, and farm. Once you know this one new sound, you can read a huge number of new words.
Mastery looks like: They read ar words with the correct "ar" sound automatically, without trying to force a short or long a.
Common stumbles: Trying to read the a as short or long instead of blending it with the r into one new sound.