-Authors: ThS. Trần Thị Hải Bình (2014)
It is important to understand errors made by learners in foreign language teaching and learning process. However, there has been scarify any research on the causes of errors in students’ writing in English in Vietnamese universities. This study has been carried out to clarify the errors in the use of cohesive devices by the freshmen at pre-intermmediate level of English at Thang Long University. Basing on the theoretical background of other error studies in the field and the statistic collected from the reality, the study has found out the frequency of each kind of errors, analyzed the causes of these errors. Then, some suggestions for teaching conjunctions and correcting these errors... 
