i learned how add plural suffix in a regular plural nouns:
"As was mentioned earlier, we add the plural suffix –s to most words:
- cat → cats
- bear → bears
- zebra → zebras
However, after sounds s, z, sh, ch, and j, we add the plural suffix –es:
- class → classes
- sash → sashes
- fox → foxes
Some words that end in z also double their ending consonant, like quizzes."