. first year EFL students at Vinh University, and Le Thi Bich Thuy (2006) carried out an action using CL with her second-year students at Gia Lai Teacher Training College. These studies have proven. Vietnamese high schools where CL has been recently applied, the results from a research done by Phi Thanh Tra (2006) show that although CL has been employed with a view to improving students’ speaking. in order to have a successful CL lesson, teachers play a very important role. Pham Thi Hong Thanh (2008) examined perceptions of the respective roles and responsibilities of Vietnamese teachers