In Italian, nouns can be masculine or feminine.
Masculine nouns often end in -o.
Example: libro (book), telefono (telephone), divano (sofa).
Feminine nouns often end in -a.
Example: casa (house), bottiglia (bottle).
Some nouns end in -e.
These can be masculine or feminine.
Masculine: padre (father), cameriere (waiter), latte (milk).
Feminine: madre (mother), stazione (station), televisione (television).
Some nouns ending in -e refer to people. In this case, the gender depends on the person.
Carla è insegnante → feminine.
Franco è insegnante → masculine.
The number can be singular or plural.
Masculine nouns ending in -o change to -i.
Example: libro → libri (book → books).
Feminine nouns ending in -a change to -e.
Example: tazza → tazze (cup → cups).
Nouns ending in -e, both masculine and feminine, change to -i.
Example: cane → cani (dog → dogs), lavatrice → lavatrici (washing machine → washing machines).
Foreign nouns are usually masculine and do not change in the plural.
Example: bar → bar, sport → sport, computer → computer.
Nouns with an accent do not change in the plural.
Example: caffè → caffè, università → università, menù → menù.
Some nouns ending in -ista can be masculine or feminine.
In the plural they change differently:
masculine: dentista → dentisti
feminine: dentista → dentiste
In Italian, every noun has a gender and changes in the plural depending on its ending.
There are some exceptions, but with practice you will get used to them.