Introduction
Language is characterized by set of vocal sounds which can be decoded. These are produced by human organs of speech- lips, tongue, and larynx etc. The vocal sounds produced by the vocal organs are used in various systematic and rule governed combinations. Language is thus a human phenomenon that has form which can be described in terms of the units of sound (phonemes), words, morphemes, phrases, and paragraph or discourse. Human language is unique in the sense that it has its own structure, its own system of organizing its component units into meaningful patterns.
English, Nigeria’s official language, occupies a unique place in Nigerian education today; not only has English been adopted as the principal medium of instruction in Nigeria’s educational institutions but it has also been institutionalized as the language of educational evaluation in Nigeria school system.
