FREE R Controlled Vowels Posters! Free R Controlled Vowels Posters! Visual cues often help our young readers learn phonics rules. Display these posters in your classroom or within your small group intervention area. Post around the classroom or print and send them home with your students ar, er, ir, or, and ur are all here! The R-Controlled Vowel Posters can be downloaded for FREE in my online Teachers Pay Teachers store. Teaching r-controlled vowels When a vowel is followed by an r, the r changes the sound that the vowel makes.  That vowel is called an r-controlled vowel.  Sometimes teachers refer to the “r” as the “bossy r” because the r “bosses” the vowel to make a new sound.  When