Contrary to figurative language which is commonly used in advertising, plain language refers to the unadorned, clear and ordinary one, which also finds its wide application in the same field.

Nevertheless,after observing and studying lots of English linguistic facts,this article holds that there are some rules for these structures,and has analyzed them from their syntactic a.

This article introduces auto the orign and development tendency of OSEK/VDX system and the characteristics of its Operating System、Communication Norm、Net Management、Implement Language.

,the linguistic reality,the social conventions and the speaker s psychological motivation.

We classify the objects to which teacher s codeswitching adapts into the linguistic reality,the teacher s roles and the teacher s speech intention.

This paper tries to analyze the function of Chinese-English code-switching on campus and points out that it is adaptive to linguistic reality、social conventions and mental motivation.

The application of this method can help students participate in language practice and improve their communicative ability.

Big class teaching is disadvantageous to language practice, so it should be pay attention to speaking and writing in which students are provided with enough practice chances so that their English applicative abilities may develop.

The test-oriented English education tends to neglect the leading function of language practice in teaching.

People generally think archaic Chinese studying abstruse and uninteresting ,use language examples fully can shorten the distance between ancient and present and make our teaching interesting.