chapter  45
Generative grammar
ByShigenori Wakabayashi
Pages 16

One of the major contributions of generative grammar to our understanding of human language has been to foreground facts about language that previously went unrecognized, or were considered unimportant, such as the fact that who and he can refer to the same person in (1a), but not in (1b), and that every native speaker of English knows this without ever having been taught it:

(1a) Who said he didn’t vote? (1b) Who did he say didn’t vote?