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240 M. A. K. HALLIDAY of the adult semantic system, being built into the heart of language in the form of the ideational (representational, referential, cognitive) and the interpersonal (expressive-conative, stylistic, social) components of meaning. All utterances in adult speech contain both these components, which are mapped on to each other by the structure-forming agency of the grammar. The original social functions survive in their concrete sense as types of situation and setting, the social contexts in which language serves in the transmission of culture to the child.