Since all second language learners belong to one or other group of language, their pronunciation of second language is very different of their origin. The teaching of a foreign language always deals with changing of learner's pronunciation as learners find it difficult to pronounce the diphthongs. The pronunciation of one person depicts his geographical identity; hence a person's pronunciation reveals his complete personality including origin and his social background. The pitch of the voice, the speed and the utterance all indicate the background and the linguistic knowledge of that person. It is an acknowledged fact that the speaker of the second language utters the sounds through the basic knowledge that he has built up in his mother tongue. It is through the pronunciation that we distinguish between American, British and Cambridge speakers. Although all these use a Standard English accent yet they are different from one another in terms of their accent and pronunciation.Therefore what is needed and what we are concerned within Pakistan is the achievement of a comfortably intelligibility. It is very important for second language learners to pronounce correctly and follow a particular accent. There is a need to train the second language learners to pronounce the phonemes correctly. In teaching correct pronunciation we shall be able to draw inferences to determine and overcome the factors that hinder our speech. Joanne Kenworthy (1987) states, "Learner needs to develop concern for pronunciation. They must recognize that poor unintelligible speech will make their attempts at conversing frustration and unpleasant both for themselves and for their listeners".