The spelling of the phrase "are on back of" may initially seem straightforward to native English speakers, but to those learning the language, it can be confusing. The pronunciation is /ɑr ɑn bæk əv/. Here, the "r" sound is pronounced and the "e" in "are" is silent. "On" is pronounced with a short "o" sound and "back" with a short "a" sound. "Of" is pronounced as a schwa sound. This serves as a reminder that English spelling can be tricky and unique pronunciation rules should be learned to avoid errors.