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Brannon, John B., Jr. – Language and Speech, 1968
A group of three-year-old children was compared to one of four-year-old children in the usage of 26 syntactic transformations on the basis of 60 utterances per child. The older group used significantly more sentence transformations per child and significantly fewer simple active declarative sentences than the younger. Among the older group 10 out…
Descriptors: Child Language, Language Usage, Linguistic Competence, Linguistic Performance

Aitchison, Jean; Bailey, Guy – Journal of Linguistics, 1979
Examines the idea of a mismatch between grammaticality and acceptability. Evidence is used to refute the claim that ungrammatical but acceptable sentences are theoretically plausible in the case of the sentence, "A not unhappy person entered the room." (AMH)
Descriptors: Comprehension, Deep Structure, Grammar, Grammatical Acceptability