Preliminary data of the biodiversity in the area INTELLIGIBLE PRONUNCIATION TEACHING ENGLISH TO VIETNAMESE LEARNERS Do Anh Tuan* University of Da Nang Campus in Kon Tum 704 Phan Dinh Phung Street, Kon Tum City, Kon Tum, Vietnam Received 15 May 2020 Revised 11 September 2020; Accepted 25 January 2021 Abstract L1 (first language) phonological transfer in L2 (second/foreign language) learning appears unavoidable; concerns are whether it is positive or negative and which strategies could help to dea[.]