ir

R-controlled vowel: 當母音後面跟著r,r會影響母音的發音

stir, sir, whir, fir, firm, affirm, confirm, third, bird, lovebird, dirt, dirty, flirt, shirt, undershirt, skirt, headfirst, first, thirst, thirsty, girl, swirl, twirl, whirl, girth, mirth, birth, birthday, irk, quirk, shirk, smirk, squirm, squirt, squirrel, circle, circular, circulate, circus, chirp, birch, virtue, virtual, girdle, circumvent, circumstance, infirmary