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

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

Sociolinguistics is the study of language in relation to society.

Semantics

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.

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

Modern linguistics is mostly prescriptive, but sometimes descriptive.

Linguistics

Phonetics

Findings in linguistic studies can often be applied to the settlement of some practical problems. The study of such applications is generally known as a（）linguistics.