The spelling of the word "bed right" is determined by its phonetic transcription, /bɛd raɪt/. The first syllable, "bed," is pronounced with an open-mid vowel sound as in "bet." The second syllable, "right," is pronounced with a diphthong that begins with the vowel sound in "eye" and ends with a schwa sound. The letter "i" represents the first sound in the diphthong, while the letter "t" at the end of the word is silent. As a result, the correct spelling of this word reflects its phonetic pronunciation.