Sometimes I need to change
ies but for
survey, it's not. So far as I know there are some other cases too.
Is there any "formula" I can follow for the plural form of words with
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You're missing half of the rule.
Yes, you change -y to -ies but only if the letter preceding the y is a consonant.
If the word ends in a vowel plus -y, you just add an s.
a. If the word ends in a vowel (a,e,i,o,u) + y then just add s boy - boys, journey - journeys, key - keys, tray - trays, donkey - donkeys... Or we'd have too many vowels and a confusing word (key - keies)!!!