Hi, what do you want to do?
Fact Monster
Fact Monster: Spelling Plural Nouns
A chart that shows general rules for regular and irregular plural formations for nouns, plus a list of some exceptions.
Grammarly
Grammarly Blog: Spelling Plurals With S or Es or Other Plurals
Spelling rules and examples for adding -s or -es to make the plural form of a word.
Other
Speakspeak: Spelling: Changing Y to Ies, Ied, Ier
A few rules and examples help students understand when and how to change words which end in -y, for plural nouns, verb forms, adjective and adverb forms.