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Grammarly
Grammarly Blog: Plural Nouns
An explanation with examples of plural nouns and the spelling rules involved in pluralizing a noun.
Other
Reading From Scratch: Spelling Rules
The "Reading from Scratch" site provides a list of spelling rules with examples.
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.
Other
The Schoolhouse: Lesson 16: Spelling Rule Plural Endings
Learn about making words plural by adding "es" through examples, sentences, and practice exercises.
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
Spelling It Right: Plurals of Words Ending in "X," "Sh," "S," "Ss," and "Ch"
Learn about making words plural by adding "es" through examples and practice exercises.
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.