The spelling of the phrase "art proud of" is fairly straightforward. The first word, "art," is spelled with the vowel sound /ɑː/, which is a long "ah" sound. The second word, "proud," is spelled with the diphthong /aʊ/, which is a combination of the vowel sounds /a/ and /ʊ/. The final word, "of," is spelled with the short vowel sound /ə/, which is a neutral sound pronounced as a short "uh." Together, the phrase sounds like "ahrt prow-dahv."