Many nouns add an -s to become plural. However, nouns ending in -s, -ss, -sh, -ch, -x, and -z add -es to become plural. Look at these examples:
Singular noun: box
Plural noun: boxes
Singular noun: lunch
Plural noun: lunches
Nouns ending in s, -ss, -sh, -ch, -x, and -z add -es to become plural.
It’s your turn. Make this singular noun into a plural: class. Did you figure it out? Good for you!