Any = Questions in plural/uncountable -----eg. Have you got any trousers(uncountable)/oranges (countable, plural)/advice (uncountable)? Negative sentences------eg. I dont have any trousers/oranges/advice.Some = Positive sentences in plural countable/uncountable------eg. I have some trousers/ oranges/advice. "Some" se usa tambin en oraciones interrogativas en peticiones, ofrecimientos o cuando se espera que la respuesta del oyente sea afirmativa.A/an= Singular and countable nouns------ eg. I have an orange/a car/ an idea