Introduction:Phases of Chomskyan linguistic theory 1950's SS(Syntactic Structures)Model (early patterns); 1960's ST(Standard Theory)Model (Aspects Model or Standard Theory); 1970's EST (Extended Standard Theory)Model; 1980's GB(Government and Binding)Model; 1990's MP(Minimalist Programme)Model.Introduction: Phases of Chomskyan linguistic theory • 1950’s SS (Syntactic Structures) Model (early patterns); • 1960’s ST (Standard Theory) Model (Aspects Model or Standard Theory); • 1970’s EST (Extended Standard Theory) Model; • 1980’s GB (Government and Binding) Model; • 1990’s MP (Minimalist Programme) Model