What are some words that change the y to an you add er or est?

You're thinking of words that follow a common spelling rule: change the "y" to "i" before adding "-er" or "-est" when the "y" is preceded by a consonant.

Here are some examples:

* happy -> happier, happiest

* easy -> easier, easiest

* dry -> drier, driest

* heavy -> heavier, heaviest

* funny -> funnier, funniest

* pretty -> prettier, prettiest

* busy -> busier, busiest

* dirty -> dirtier, dirtiest

* lucky -> luckier, luckiest

* angry -> angrier, angriest

Exceptions:

* Words ending in a vowel + y: These words do not follow this rule. For example, "boy" -> "boyish"

* Proper nouns: Proper nouns ending in "y" also don't follow the rule. For example, "Mary" -> "Mary's"

Let me know if you'd like to see more examples!