In order to obtain a better understanding of L2 learners, transitional knowledges, it is very important and necessary to have a better knowledge of interlanguage. According to Corder, the role of interlanguage in English education holds significance to (1) for language teachers, (2) for language learners themselves, and (3) for language textbook compilers. To me the significance of interlanguage in English education can be described in terms of not only language teachers, learners themselves, textbook writers and compilers but pure linguists, applied linguists, school authorities as well as parents. For language learners themselves a clear understanding of interlanguage results in students being receptive to language input, and the avoidance of mental block, and low levels of foreign language anxiety. Native speakers of English (NSE) reflect not only linguistic features but also psychological, socio-linguistic, and discourse features when engaged in communication activities. This means that L2 learners are introduced to these different features, especially pragmatic features which are different from their mother tongue or L1 when engaged in communication with NSE. Hence the importance of interlanguage pragmatics should be recognized. It is very important that teachers of English should have a better understanding of interlanguage and present L2 learners with their interlanguage features so they can avoid any misunderstandings such features may cause when conversing with NSS. It should also be noted that interlanguage can form the foundation of language acquisition theory and linguistic analysis.