Rule One.
Rule 1 - To make a plural form, add s to the singular form.
But if the noun ends in s, x, z, ch, or sh, add es to the singular form.
Examples :
| Singular | Plural | Singular | Plural | |
|---|---|---|---|---|
| Adding s | boy | boys | girl | girls |
| wave | waves | surprise | surprises | |
| Adding es | glass | glasses | tax | taxes |
| peach | peaches | flash | flashes | |
| waltz | waltzes |
