Language

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.

Phonology

Social changes can often bring about language changes.

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

Both semantics and pragmatics study meanings.

Morphology

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

Modern linguistics regards the written language as primary, not the written language.

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.