Semantics

Language

Phonetics

The distinction between competence and performance was proposed by F. de Saussure.

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

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

The study of the ways in which morphemes can be combined to form words is called morphology.

Morphology studies how words can be formed to produce meaningful sentences.

Phonology

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.