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

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

For example:

• defy: defies / defying / defied
• apply: applies / applying / applied

Adapted from: Oxford Dictionaries: Spelling Rules and Tips (http://www.oxforddictionaries.com/words/spelling-rules-and-tips)