Of all the grammar concepts we have, "plural" seems to be one of the most straightforward. You got one thing? It's singular. Got more than one thing? It's plural. But alas, language is always less ...
“Moose” fell into the latter category; its origins can be traced back to both the Eastern Algonquian and Narragansett languages, which used neither mutations nor the standard modern pluralizations.
Before you slip that letter into the mail, find out how to properly write plural last names. Here, etiquette and grammar experts explain.