If a word ends in a y preceded by a consonant, change the y to i before adding any suffix, unless the suffix is ing.
worry - worrisome - worrying
study - studious - studying
lazy - laziness
try - tried - trying
If a word ends in a y preceded by a vowel, form the plural by simply adding an s.
key - keys
day - days
play - plays
(From Write for Business, page 216, and Proofreader's Guide PDF, page 28)
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