The spelling of the two-word phrase "be business" is quite straightforward. The word "be" is pronounced as /bi/ in IPA phonetic transcription, and the word "business" is pronounced as /ˈbɪznɪs/. The first syllable of "business" is pronounced the same as the "be" in "be," and the second syllable is pronounced with a short "i" sound followed by the "z" sound. So, when written together, the word is simply spelled as "be business," with each syllable pronounced as described above.