When a verbs ends in s, sh, ch, o, x,z,add es to the

3ra persona singular (he, she, it)
Examples:
do      does
kiss      kisses
wish      wishes
watch      watches
box      boxes
buzz      buzzes
go      goes
fish      fishes
miss      misses
catch      catches


when a verb ends in y and the previous letter is a consonant , change the y to i and add es example study - studies

when a verb ends in y and the previous letter is a vowel , add s to the 3rd person singular example
play- plays

fly       listen s
buy       wrile s
cry       play s
reply       dance s
pay       sing s
say       talk s
lay