Hi. Similar to your other posed question given in, http://www.italki.com/answers/question/59929.htm You may again refer to the knowledge database in italki, available at: step 1: http://www.italki.com/knowledge/italian step 2: http://www.italki.com/knowledge/wikilist-italian-english-1-[sl].htm step 3: http://www.italki.com/knowledge/wiki-Italian+Articles.htm Hence, from there, it lists out the rules for the indeterminative (indefinite) and partitive (plural indeterminative) articles. In general, For masculine singular (including the ones starting with a vowel): un ; For masculine plural: dei ; For masculine singular starting with impure consonants: uno ; For masculine plural starting with impure consonants: degli ; (Impure consonants are defined as "z", "s"+consonant, "gn", "pn", "ps" or "x".) For feminine singular: una ; For feminine singular starting with a vowel: un' ; For feminine plural: delle. Good day. / Buona giornata.

hola mira, "un" es un artículo indefinido y se usa asi: singular masculino = "un" examples un lápiz, un niño, un borrador plural masculino = "unos" unos lápices, unos niños, unos borradores singular femenino = "una" examples; una niña, una flor, una casa plural femenino = "unas" unas niñas, unas flores, unas casas El articulo indeterminado UNO se emplea adelante de una palabra masculina que comienza en S+consonante,Z,GN,PS. hay una diferencian entre uno y otro niño