As the reform of public English teaching in vocational colleges in China, the credit hours of public English in vocational colleges have been shortened greatly. But many vocational colleges still require teachers to achieve the teaching efficiency in the past and improve the students' public English abilities steadily. It is a big problem that public English teaching in vocational colleges is facing now. Moreover, vocational students' English knowledge is at different levels, and many of them come from villages and towns in China. This makes the teaching tasks of public English very difficult. Under such background and teaching environment, the vocational public English classes began to implement stratified teaching. This article inquires overtly stratified teaching pattern and covertly stratified teaching pattern of public English in vocational colleges and even the pros and cons of each pattern. The author hopes that through this research, public English teachers can help the students activate potential of English, and help students improve their English.
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