Definite articles are used when referring to a specific noun.
Masculine SIngular. Plural
Before a consonant. il I
Before s+consonant lo. gli
Before a vowel. l’ gli
Feminine
Before a consonant. la le
Before a vowel. l’ le
il passporto / i passaporti
lo studente / gli student I
l’arrivo / gli arrivi
la borsa/ le borse
l’uscita/ le uscite
Indefinite Articles
Must agree with gender and number of the noun
Masculine
Before most nouns. un
Before s+consonant
(or) z uno
Feminine
Before a consonant. una
Before a vowel. un’
un’aranciata