English has a very dynamic status today. One can literally witness its circle widening day by day, engulfing in it a wide spectrum of varieties. English is a pluri-centric language, i.e. language with more than one accepted standard and set of norms for creativity. The spread of English across the globe took place due to two reasons: first, the displacement of the native and second, the establishments of colonies across. Afro-Asian countries. In the presented research paper L1 (also is known as mother tongue and native language) is Arabic and L2/FL is English. The focus is made on phonological and grammatical problems and how the interference of L1 affects the acquisition of L2. There are many alphabets of English which do not have their equivalent in Arabic. Learners try to substitute them with the English alphabet which is closer in pronunciation in Arabic. They, particularly the learning community, do some unusual mistakes in English spelling and pronunciation. The aim also is to review some linguistic terms and literature related to Language interference. At later stage, data were collected and analyzed to come out with the conclusion that the learners' environment of living, the exposure he/she gets to the language, the teaching-learning process are also a part of the culture along with the L1.