When a verbe ends in y & the previous latter is a consonant change they to i and add es examples:

Study- studies
Do- does
Kisss- kissses
Wish- whishes
Watch- watches
Box- boxes
Buzz- buzzes
Go- goes
Fish- fishes
Miss- misses
Catch- catches

When a verbs ends in y and the previous latter ir a vocalle add s to the 3rd person singular examples:

Play-plays
Fly- flys
Buy- buys