Tipsy kid thinks it's time for an English lesson

Listen up kids. Here’s how you make things plural. Don’t laugh, this is important:

If it ends in a consanant or a vowel, you add s.
ex: hairs

If it ends in an s, you add es.
ex: mouses

If it ends in y, you change it to ie and then add s.
ex: boies

Sometimes, the plural form is just the word itself.
ex: socialism