From the LAD develops a formal grammar with a finite set of rules shared by all speakers of the language. Most of these rules were acquired by 5 years of age.
From the formal grammar an infinite number of sentences can be generated.
Proponents of the Linguistic Induction theory support this view by noting the lack of an observable direct link between language input and out put, or a relationship between teaching (corrections) and performance.
In addition, the similarity of patterns of grammatical development between cultures suggests to them a major role for genetic factor.
Children simply understand more about language than can be accounted for by the sum of their limited language experiences.