The correct spelling of the word is "be mistake." Using the International Phonetic Alphabet (IPA), we can analyze its pronunciation as follows: /biː mɪˈsteɪk/. The first syllable "bi" is pronounced with a long "e" sound, while the second syllable "mi" is pronounced with a short "i" sound. The stress falls on the second syllable, which is why the "a" in "mistake" is pronounced as the schwa sound /ə/. With this understanding of its IPA representation, we can confidently spell and pronounce the word "be mistake."