An analysis of English simple past tense and present perfect tense errors made by the grade 10- students at Cao Lanh City High School B.A Thesis. Major: English Pedagogy. Degree: Bachelor of Art - Huynh, Le Minh Trung; Huynh, Cam Thao Trang; Le, Hoang Yen; Phan, Thi My Dung (Dong Thap University, 2010)