The revolution in English grammar became obvious in 1957 when Noam Chomsky’s Syntactic Structures appeared. This book showed that the sentences of daily use, in all their infinite variety, are formed by transformation of a finite number of underlying structures. With this interest in structure came awareness that our understanding of a sentence is achieved through a perceptual process of extreme perplexity. This achievement is mysteriously attained, uniformly and rapidly and, to a high degree, quite independently of intelligence. In a word, language is an extension of the sensory life and we learn it as we learn to touch and see and hear.