Transformational–Generative Grammar Visualizer (after Chomsky, Aspects of the Theory of Syntax, 1965)

Example sentence: Transformation:

Speed:

Base Phrase-Structure rules: S → NP Aux VP · VP → V NP · NP → Det N · Aux → Tense
Lexicon: Det→the · V→{hit, chase, kiss} · N→{man, ball, dog, cat, teacher, student} · Tense→PAST

phrasal node (S, NP, VP, PP) lexical category (Det, N, V, Aux...) inserted by the transformation structure being acted on (deep structure) movement / affix attachment

Deep Structure (left) → Surface Structure (right)