AU - Abu Agla, Yusuf Altiraifi Ahmed. AU - Modhawi, Ali Khalid AU - El Jack, Nada Said Ahmed ID - 25479 OP - pp. 56-63 T1 - Investigating main causes of errors in Sudanese secondary school students spoken English : a case study of some secondary school students in Omdurman locality, Khartoum State [Article] UL - 1 http://search.shamaa.org/fulltext.gif http://www.sustech.edu/staff_publications/20150429074112287.pdf Full text (PDF)