Politeness Principle is the most important principle in language communication, which is also the key factor in language application. To achieve the successful communication, communicators not only observe Cooperation Principle, but also Politeness Principle. The traditional English classroom teaching generally follow CP in universities, however, PP gradually becomes the basic norms in the influence of ecological teaching idea. This paper attempts to study application of PP in teaching combined with video transfer materials, aiming to stimulate students' enthusiasm on learning English and improve teachers' teaching level, building up a harmonious and friendly classroom environment.
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