The critical phrase here is ``functions which we presume to be general to all cultures ' or , as he put it a little earlier , ``creating his own language on what is presumably a phylogenetic model ' What Halliday seems to be suggesting is that the protolanguage emerges from the child 's ``natural ' adaptation to , and interaction with , a social environment . With the child 's switch to the adult language , on the other hand , we see both the influence of an already existing...











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