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Language and culture teaching studies , sociolinguistics and cross-cultural communication .

社会语言学和跨文化交际学。

Sociolinguistics thinks that grammar is a necessary part of communicative competence .

社会语言学家认为语法是交际能力的必要组成部分。

Why should language instructors look to sociolinguistics ?

语言教师为何应当关注社会语言学？

What implication can we get from sociolinguistics ?

从社会语言学中可以得到什么启示？

Sociolinguistics is a marginal subject .

社会语言学是一门边缘性学科。