When forming the plural of Italian nouns, the vowel endings change to indicate a change in number. For regular masculine nouns that end in -o, the ending changes to -i in the plural.

The table below includes a few nouns to start with:

Regular feminine nouns that end in -a take on -e endings in the plural.

When forming the plural of nouns ending in a consonant, such as words of foreign origin, only the article changes: il film/i film. la photo/le photo. Here are some exceptions to the rule for forming feminine plurals:

• Feminine-noun ending -ea changes to -ee in the plural. For example: dea/dee (goddess/goddesses).
• Feminine-noun ending -ca changes to -che in the plural. For example: amica/amiche (friend/friends). Remember that -che is pronounced as "keh" in Italian.

Finally, be aware that some nouns end in -e. The plural forms of these nouns will end in -i (regardless of whether these nouns are masculine or feminine).