If the word ends in a consonant followed by "y", change the "y" to "i" before adding a suffix, unless the suffix begins with "i".
Examples:
* Happy + -er = Happier
* Cry + -ing = Crying
* Dry + -ness = Dryness
Exceptions:
* If the suffix begins with "i", the "y" remains unchanged.
* Baby + -ish = Babyish
* Story + -ing = Storying
Reasoning:
This rule is based on the pronunciation of the "y" sound at the end of these words. When the "y" is preceded by a consonant, it's pronounced like the "i" in "tin". By changing the "y" to "i", we maintain this pronunciation when adding suffixes.
Let me know if you'd like more examples or have other spelling questions!