ABSTRACT
A constraint in the Revised Extended Standard Theory (REST) of transformational grammar which prevents overgeneration by syntactic rules. Filters are language-specific constraints on wellformedness at the surface structure: for example, in Chomsky and Lasnik (1977), the ungrammatical sentence *Who did we want for to win? is excluded by
perform functions which correspond to dependency among the application of transformational rules ( transformation) in the early stages of transformational grammar.
