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 |
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