The UVic Writer's Guide
A final "y" becomes "i" before all suffixes except -ing. Happy becomes Happiness while cry becomes crying. If a vowel precedes the "y" (donkey) then the rule does not apply, and the plural will be donkeys.
Exceptions include lay, pay, and say, which become laid, paid, and said.
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Copyright, The Department of English, University of Victoria,
This page updated Sept 23, 1995