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

The study of meaning in language is known as semantics.

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.

Both semantics and pragmatics study meanings.

Modern linguistics is different from traditional grammar.

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

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

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

Modern linguistics is mostly prescriptive, but sometimes descriptive.