Transformational grammar (TG) Standard theory (ST) Extended standard theory (EST) Revised extended standard theory (REST) Principles and parameters theory (P&P) Government and binding theory (GB) Minimalist program (MP) Monostratal (or non-transformational) grammars Relational grammar (RG) Lexical-functional grammar (LFG) Generalized phrase structure grammar (GPSG) Head-driven phrase structure grammar (HPSG) Categorial grammar Tree-adjoining grammar