Due to the phonetic differences between the Arabic language and the English language, Arab ESL learners often experience difficulty pronouncing English vowels. The quantity and quality of vowels are the two phonetic parameters through which vowels are described. The quantity of vowels refers to the duration of the phonetic segment symptomatic of the phonetic identity. On the other hand, vowel quality means knowing the precise way to articulate a vowel, which includes the shape of the lips, the position of the tongue in the vocal tract, or the nasalization of vowels. Each vowel has its own speech pattern. The Arabic language system consists of 6 vowels while the English vowel system has 12. The main reason why Arabic ESL learners tend to mispronounce vowels is this phonological difference. Additionally, the extended vowel configuration system of English shows a contrast between lax short vowels and tense long vowels; on the other hand, the vowel patterns of the Arabic language show a contrast between short vowels and long vowels. Moreover, the difference between the English and Arabic vowel system depends not only on its size but also on the quality of the vowels. Another reason why Arabic ESL learners have problems with English vowels is the nature of the vowel system: the Arabic language has a centrifugal vowel system while the English language has a centripetal vowel system, meaning that English vowels tend to move toward the center of the vowel space, which does not happen with centrifugal vowel systems like Arabic, Spanish, and Russian. Thus, it is because of the distinct vowel quality, quantity, centrifugal and centripetal differences that Arabic ESL learners pro...... middle of paper ...... connected speech ", Antwerp papers in linguistics, 2002, 100, 77-86.Shei, C. and Pain, H. “Collocational help for an ESL writer”. Computer-assisted language learning, 2000, 13, 167-182.Shehata, AK “Influence of L1 on Advanced English ESL/EFL Arabic Learners’ Reception and Production of Collocations Department of Linguistics and College of Arts and Sciences, 2008. Wang, J. T & Good, Robert.” L. “Corpus study of lexical collocations of verb nouns in EFL textbooks”. CELEA Journal, 2008, 31 (5), 1-11. Watt, D. “I don't speak with a Geordie accent, I speak like l 'Northern accent: contact includes leveling in the Tyneside vowel system'. Journal of Sociolinguistics, 2002, 6, 1, 44-63. Arabic of English: a study of lexical semantics”. Babel, 2003, 49(1), 59-81.