We do not for example say that the person has a perfect knowledge of some language L similar to English but still different from it. What we say is that the child or foreigner has a 'partial knowledge of English' or is 'on his or her way' towards acquiring knowledge of English, and if they reach this goal, they will then know English.
Noam ChomskySilicon Valley benefits, as all of industry, from highly protectionist policy - patent policies and things like that - which come out of the government.
Noam Chomsky