An article is a small word that specifies a noun as a specific (the train) or non-specific (a train). The former type of article is called the definite and the latter is called indefinite.

DEFINITE

• SINGULAR
  • La fem. before consonant
  • L' masc. & fem. before vowel
  • Lo masc. before s + consonant, z, y, ps, pn, gn.
  • Il masc. before consonant.
• PLURAL
  • Le fem.
  • I masc.
  • Gli mascc. before vowel, s + consonant, z, y, ps, pn, x or gn

INDEFINITE

• Un this indefinite article is used when the noun is masculine singular and begins with a consonant or a vowel.
• Un' this indefinite article is used when the noun is feminine singular and begins with a vowel.
• Una this indefinite article is used when the noun is feminine singular and begins with a consonant.
• Uno when the noun is masculine singular and begins with s + consonant, ps, pn, z, x, y or gn.

PARTITIVE

• the partitive articles are formed by the union of the preposition "of" with the definite article.
• used to indicate a non-specific quantity and is always placed before the name. in english this would be like saying some amount
• simple propositions and their contractions x
• the following adjectives expresse quantity:
  • molto, molta - a lot of/too much
  • troppo, troppa - a lot of/too much
  • tanto, tanta - a lot of/too much
  • poco,poca - a bit of/a little bit of
  • assai - a lot of/too much
• the following adjectives express #’s
  • molti, molte - many
  • troppi, troppe - many
  • tanti, tante - many
  • un po' di - a bit of
  • assai - a lot of - too much
  • pochi, poche - a few