Halliday proposes a theory of metafunctions of language, that is, language has _______, interpersonal and textual functions. 2. In any language words can be used in new ways to mean new things and can be combined into innumerable sentences based on limited rules. This feature is usually termed __________. 3. ___________ relates the study of language to psychology. It aims to answer such questions as how the human mind works when people use language. 4. Our language can be used to talk about itself. This is the ________ function of language. 5. When language is used for establishing an atmosphere or maintaining social contact rather than exchanging information or ideas, its function is ________ function. 6. The branch of linguistics which studies the sound patterns of a language is called __________. 7. The branch of grammar which studies the internal structure of words is called _______. 8. ________ mainly studies the characteristics of speech sounds and provides methods for their description, classification and transcription. 9. Semantics and ________ investigate different aspects of linguistic meaning. 10. In linguistics, _________ refers to the study of the rules governing the way words are combined to form sentences in a language, or simply, the study of the formation as sentence. 11. _________ can be defined as the study of language in use. Sociolinguistics, on the other hand, attempts to show the relationship between language and society. 12. The branch of grammar which studies the internal structure of sentence is called _____.