"What principle allows this use? This is called 'reclassification': the adjective divides the unique item into countable pieces. In your first example, America is divided grammatically into 'a beautiful America' and 'an un-beautiful America' englishnewbie Also, does this apply to "a huge information" or not?
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englishnewbieI know that we can say "a beautiful America" or "an angry Obama."What principle allows this use?This is called 'reclassification': the adjective divides the unique item into countable pieces. In your first example, America is divided grammatically into 'a beautiful America' and 'an un-beautiful America'
englishnewbieAlso,
englishnewbiewhat about the "huge information" thing?See for more information about the use of determiners with various classes of nouns with respect to countability. Note that information is a Class I noun on the chart given there, which means it can never take a determiner.
englishnewbieDo I HAVE TO stateHe has A refined knowledge of the new system.You do.
englishnewbie1) If I must use "a refined knowledge," then does this mean that this principle applies to all nouns that are classified as uncountable/singular?It is exceedingly rare for any principle in English to involve "all"