What are nouns that end in y and add s?

You're asking about a specific rule in English grammar, but it's not quite that simple! Here's the breakdown:

Nouns ending in "y" generally follow these rules:

* If the "y" is preceded by a consonant: Change the "y" to "i" and add "es"

* Examples: baby -> babies, city -> cities, story -> stories

* If the "y" is preceded by a vowel: Add "s"

* Examples: boy -> boys, toy -> toys, monkey -> monkeys

Important Note: There are some exceptions to these rules:

* Proper nouns ending in "y" often just add "s":

* Examples: Mary -> Marys, Henry -> Henrys

* Some nouns ending in "y" have irregular plural forms:

* Examples: fly -> flies, cry -> cries

Let me know if you'd like more examples or want to explore the "why" behind these rules!