Subjects of this research are three-graders from one primary school in Nanning.Among the whole grade, 12 students were willing to attend our volunteer tutorial class for learning English. They ranged in age from 8 to 9, including 6 male students and 6 female students. Except regular curriculums in their own school, none of them has been to extracurricular tutorial classes before. Detailed information of subjects is listed in the following table