On phonotactically motivated rules

The main thesis of this paper is that the grammars of natural languages contain an exhaustive set of conditions on the output of the phonological rules – in fact, a surface phonotactics. I shall show that, contrary to what is usually assumed in generative phonology, a surface phonotactics is not redundant in a generative grammar if the grammar is indeed intended as ‘a theory of linguistic competence’ (Chomsky, 1965: 3), and that if any set of rules in the phonological section of the grammar is redundant it is the morphophonotactic rules, better known as morpheme structure conditions. I shall propose a format for the statement of rules (including so-called ‘conspiracies’) which are ‘motivated’ by the phonotactics in the sense of Matthews (1972: 219–220). Finally, I shall present a set of phonotactic rules for consonant clusters in Latin, and show how the statement of certain rules of Latin phonology can be simplified by taking their phonotactic motivation into account.