/ar/ /or/ /ɪr/
So, just to keep you on your toes, here are three more times the letter r changes the sound of the vowel(s):
/ar/ spelled as ‘ar’
ar can be found anywhere in a word: art, dart, car — at the start, middle or end of a word.
Less commonly, /ar/ can be spelled as ‘are’ (are) or ‘ear’ (heart)
bark is a homonym (homo = same, nym = name): words that are spelled the same and sound the same but have different meanings like bark (dog bark and tree bark).
Other homonyms:
bat (baseball bat, nocturnal animal)
bank (where you keep you money, at the edge of a river)
See below to read about homonyms, homophones and homographs - the trickiest words to spell.
/or/ spelled as ‘or’
or can be found anywhere in a word, and, of course, is a word all by itself:
organ or corn or for ..
Sorry, this is our strangest video. Where did these corn soldiers come from?
Advanced
/or/ can also be spelled ‘ore’ like in more, store, score
/or/ can also be spelled ‘oar’ (board), our (your), our (door), ar (warm)
/ɪr/ spelled as ‘ear’ ‘ere’ ‘eer’ ‘ier’
(ear, near, hear, fear)(here)(deer)(pier)
Less commonly it is spelled as ‘er’ (experience)