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1. design feature: It refers to the defining properties of human language that tell the difference between human language and any system of animal communication.
2. displacement: It means that human languages enable their users to symbolize objects, events and concepts, which are not present (in time and space) at the moment of communication.
3. competence: It is an essential part of performance. It is the speaker’s knowledge of his or her language; that is, of its sound structure, its words, and its grammatical rules.
4. parole: Parole refers to the realization of langue in actual use; parole is the concrete use of the conventions and the application of the rules; parole varies from person to person, and from situation to situation.
5. suprasegmental feature: The phonetic features that occur above the level of the segments are called suprasegmental features; these are the phonological properties of such units as the syllable, the word, and the sentence. The main suprasegmental ones includes stress, intonation, and tone.
6. complementary distribution: The different allophones of the same phoneme never occur in the same phonetic context. When two or more allophones of one phoneme never occur in the same linguistic environment they are said to be in complementary distribution.
7. distinctive feature: It refers to the features that can