English language - language acquisition and language change help

aah ok for lang acq does virtuous errors or over generalizations tie in with language being a innate process (LAD) ?

I find the language change stuff difficult - particularly with things like semantic change because I don't know how we can be expected to know archaic and modern meanings of all lexemes? For example, liquor used to just mean liquid but now only refers to alcohol. I had no idea of that archaic meaning. It's things like that which make this exam tough.