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

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

Language is a system of a（）vocal symbols used for human communication.

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

Langue refers to the a（）linguistic system shared by all the members of a speech community while the parole is the concrete use of the conventions and application of the rules.

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.

Linguistics

In the study of linguistics, hypotheses formed should be based on language facts and checked against the observed facts.

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

Sociolinguistics is the study of language in relation to society.