Introduction
1-1 Introductory Note Learning vocabulary is an important aspect of the listening, speaking reading and writing skills for EFL students. This study is to investigate the efficiency of the EFL college students in learning word derivation. The present study is concerned with prefixes and suffixes since these two categories deal with forming new words and they both represent an active role in building new words in English.
1-2 The Problem of the Study “Language is one of the most fundamental aspects of human behavior and the development of language into a refined instrument of expression and communication is probably man’s greatest achievement”. (Hartmann and Stork, 1976:vii). Grammar is an essential part of any language. Since there is no language without sounds, there is no language without grammar. (Nasr, 1980: 52). In the traditional description of the grammatical system, there is usually a two fold division: morphology and syntax. According to this description, syntax deals with the distribution of words (i.e word forms) and morphology with their internal grammatical structure. [Lyons, 1981: 103]. Lado (1964: 218) stipulates that “morphology is a description of the morphemes of a language and the patterns of formation of words”. The study of the morphology of a language comprises two parts. The first deals with the realization of grammatical categories, systems or meanings by mean of inflection and the second deals with the combining of word constituents as the means of deriving new word (Jackson, 1985:5). Learning a foreign language is a difficult task for all students who find difficult in: how to select the word whose symbols accurately represent the concept which they have in their minds, and how to select the proper word to fit a concept. We all know the situation where a student has been learning over a number of years to use language in a natural context and finds that he still lacks many vocabularies