Chomsky defines “competence” as the ideal user’s k（）of the rules of his language.

A diachronic study of language is the description of language at some point in time.

General linguistics, which relates itself to the research of other areas, studies the basic concepts, theories, descriptions, models and methods applicable in any linguistic study.

Linguistics is generally defined as the s（）study of language.

Both semantics and pragmatics study meanings.

Phonetics

Pragmatics is different from semantics in that pragmatics studies meaning not in isolation, but in context.

Phonetics is different from phonology in that the latter studies the combinations of the sounds to convey meaning in communication.

D（）is one of the design features of human language which refers to the phenomenon that language consists of two levels: a lower level of meaningless individual sounds and a higher level of meaningful units.

Modern linguistics is mostly prescriptive, but sometimes descriptive.