The most common rule for forming plural nouns is
Adropping the last letter and adding -ies.
Badding -s to the word.
Cchanging the y to i and adding -es.
Dadding -es to the word.
Adropping the last letter and adding -ies.
Badding -s to the word.
Cchanging the y to i and adding -es.
Dadding -es to the word.