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General Guidelines in Forming Plurals of Nouns with Special Ending
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Words ending in “is”
They typically form their plural by changing into "es."
Although, the plural occasionally changes into “ides.”
For example, “arthritis” becomes "arthritides."
Words ending in “um”
They typically form their plural by changing to "a."
Words ending in “us”
They typically form their plural by changing to "i."
Although, the plural occasionally changes into “era” or “ora.”
For example, “viscus” becomes "vicera," and “corpus” switches to "corpora."
Words ending in “a”
They typically form their plural by changing to "ae."
Words ending in “ix”
They typically form their plural by changing to "ices."
Words ending in “ex”
They typically form their plural by changing to "ices."
Words ending in “ax”
They typically form their plural by changing to "aces."
Words ending in “ma”
They typically form their plural by changing to "s" or "mata."
Words ending in “on”
They typically form their plural by changing to "a."
Words ending in “nx”
They typically form their plural by changing to "nges."
Words ending in “y”
They typically form their plural by changing to "ies."