TG Grammar has been undergoing several stages. The classical theory consists of three parts: [填空1] grammar, [填空2]grammar, and[填空3]grammar. The first grammar is the simplest grammar which, with a finite amount of apparatus, can generate an [填空4]number of sentences. The second grammar is [填空5], simple, explicit, exhaustive, and recursive. The third grammar includes[填空6] structure, surface structure and transformational rules. The first is the abstract representation of the syntactic properties of a construction. Surface structure is the final stage of the syntactic [填空7] of a construction. The transformational rules transform the [填空8]structure of a sentence into the surface structure.