How do you form the plural of masculine and feminine nouns in Italian?

Hi Katerina, plurals (both masculine and feminine) are mainly divided into 3 categories: 1) Masculine and feminine nouns ending in -a. The masculine plural will end in -i (e.g. il pianista > i pianisti) and the feminine plural will end in -e (e.g. la montagna > le montagne). 2) Masculine and feminine nouns ending in -e. The masculine plural will end in -i (e.g. il maglione > i maglioni). Feminine plural will end in -i (e.g. la classe > le classi). 3) Masculine and feminine nouns ending in -o. Both masculine and feminine plural will end in -i (e.g. il tavolo > i tavoli; la mano > le mani). As for any grammatical rule in Italian (and any other language that stems from Latin), we have a LOT of exceptions, but the above categories should hopefully provide a good start! :)