Semantics

A scientific study of language is based on what the linguist thinks.

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

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

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

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.

General linguistics is generally the study of language as a whole.

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.

The study of meaning in language is known as semantics.

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