Regular Plurals:
* -s: cat/cats, book/books, flower/flowers, tree/trees
* -es: box/boxes, church/churches, bus/buses, dish/dishes
Irregular Plurals:
* -en: child/children, ox/oxen
* -ies: baby/babies, lady/ladies, cherry/cherries
* -ves: knife/knives, wife/wives, wolf/wolves
* No change: sheep/sheep, deer/deer, fish/fish
Other Irregularities:
* -men: woman/women, man/men
* -ice: mouse/mice
* -i: octopus/octopuses (or octopi)
* -ae: alumna/alumnae, alumnus/alumni
Let me know if you'd like to explore a specific category of plurals or have any other questions about word formation!