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

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.

Language is p（）in that it makes possible the construction and interpretation of new signals by its users. In other words, they can produce and understand an infinitely large number of sentences which they have never heard before.

Syntax

Semantics

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

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

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

Both semantics and pragmatics study meanings.

Social changes can often bring about language changes.