What is the plural of "mouse"?

Do you know how we can turn a singular noun into a plural noun? The solution is simple. Just add an '-s' at the end of the ...
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11 nouns that only have a plural form

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 ...