Curated Video
Plural Possessive Nouns
Mr. Griot explains how to change a singular noun to a plural noun. He shows how to look at endings of plural nouns and properly make them plural possessive nouns.
Khan Academy
Khan Academy: Irregular Plural Nouns Foreign Plurals
You don't need to know how to speak Latin and Greek in order to understand English, but some words in English come from those languages. It's helpful to know how some Greek and Latin words change from singular to plural.