English, in the course of its progressive evolution and global spread, has had contacts with different languages (Hogg & Denison, 2006) which have led to the emergence of native and non-native varieties spoken in different countries of the world. This, in part, has resulted in variable pronunciations of English lexical items, such as anti- pronounced as /ænti/ or /æntaɪ/ at the segmental level and adult as /'ædʌlt/ or /ə'dʌlt/ at the suprasegmental level of stress (Hogg & Denison, 2006). In addition to this, phonological free variation in English has been motivated by phonetic processes, phonological changes and sociolinguistic factors, among others (Shitara, 1993; Mompean, 2010).