Code-switching between English and Chinese usually occurs in students' talk when they are involved in taking communicative language activities in college English class. This paper studies the situations in which students are likely to use codeswitching and analyzes it from the perspective of the mental world in Verscheren's Adaptation Theory. It shows that inadequate mastery of English language, cultural differences and the improper adjustment to context may lead to students' using of codeswitching. It also shows that the use of code-switching in students' talk adapts to students' cognitive elements and emotive elements as well.
Vagueness is a linguistic phenomenon which ubiquitously exists in the communication of human languages. The use of vague language in teacher talk has an important effect on classroom interaction and teaching results. This paper, based on Verschueren's Adaptation Theory, mainly explores the adaptability of vague language in English teacher talk in the communicative classroom context. The study shows that employment of vague language in English teacher talk adapts to the communicative contextual factors. Interpreting vague language in teacher talk is conducive to understanding the dynamic process of language use.
