4.Role of Phonemes

Theoretically, the spelling of phonemes, the simplest sound elements used to distinguish one word from another, should indicate precisely the sound characteristics of the language. For example, in English, at contains two phonemes, mat three, and mast four. Very frequently, however, the spelling of English words does not conform to the number of phonemes. Enough, for example, which has four phonemes (enuf), is spelled with six letters, as is breath, which also has four phonemes (breu) and six letters. See Phonetics. The main vowel phonemes in English include those represented by the italicized letters in the following words: bit, beat, bet, bate, bat, but, botany, bought, boat, boot, book, and burr. These phonemes are distinguished from one another by the position of articulation in the mouth. Four vowel sounds, or complex nuclei, of English are diphthongs formed by gliding from a low position of articulation to a higher one. These diphthongs are the i of bite (a glide from o of botany to ea of beat), the ou of bout (from o of botany to oo of boot), the oy of boy (from ou of bought to ea of beat), and the u of butte (from ea of beat to oo of boot). The exact starting point and ending point of the glide varies within the English-speaking world.