[Subject-Verb Agreement]Final -s/-es: Use, Pronunciation, and Spelling

Use
Noun + -s	Friends are important.
Noun + -es	I like my classes.
Verb+ -s	Mary works at the bank.
Verb+ -es	John watches brids.

Pronunciation
seats /s/	t
ropes /s/	p
backs /s/	k
seeds /z/	d
robes /z/	b
bags /z/	g
sees /z/	ee
dishes /əz/	sh
catches /əz/	ch
kisses /əz/	s
mixes /əz/	x
prizes /əz/	z
edges /əz/	ge or dge

Spelling
sing	sings
song	songs
wash	washes
watch	watches
class	classes
buzz	buzzes
box	boxes
toy	toys (if -y is preceded by a vowel, only -s is added.)
buy	buys  (if -y is preceded by a vowel, only -s is added.)
baby	babies  (if -y is preceded by a consonant, the -y is changed to -i and -es is added..)
cry	cries  (if -y is preceded by a consonant, the -y is changed to -i and -es is added.)