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

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

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

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.

Syntax is different from morphology in that the former not only studies the morphemes, but also the combination of morphemes into words and words into sentences.

Pragmatics

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

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

Phonology

Chomsky defines “competence” as the ideal user’s k（）of the rules of his language.