∗ This is a revised version of a paper presented to the Conference of Teachers in Approved Schools on “Language, life and learning”, organised by the Home Office Children's Departmer t Development Group and the Programme in Linguistics and English Teaching (University College London) at Sunningdale, May 1969. I am much indebted to Professor Basil Bernstein for his very helpful comments on the paper, which already owes a lot to the inspiration of his work.
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Μ. Α. Κ. Halliday (1969) studied this question.
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