In recent years, differentiated instruction has been used to provide an alternative teaching method for teachers to use a variety of methods to teach students of different abilities during the teaching process. Differentiated instruction is a more flexible teaching method in order to fit students' diversity and to assist them in acquiring knowledge more efficiently due to the bimodal distribution of students' English. In this article, the implementation and perceptions of an experienced English teacher are examined and explored through observations and interviews which can be seen as a reference for other English teachers who intend to implement differentiated instruction at Taiwan’s primary schools.