Adding endings to words that end in -y

When adding endings to words that end with a consonant plus -y, change the final y to i (unless the ending in question, such as -ish, already begins with an i). For example:

pretty:  prettier, prettiest

ready:  readily

beauty: beautiful

dry: dryish

This rule also applies when adding the -es, -ed, and -ing endings to verbs ending in -y:

defy: defies, defying, defied

apply: applies, applying, applied

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Grammar and usage