1. We add -s to most verbs:
- talk - talks
- sing - sings
- leave - leaves
- swim - swims
- ring - rings
2. With verbs ending in -s, -ss, -ch, -sh, -o, -x, and -z we add -es to the verb.
- teach - teaches
- box - boxes
- fix - fixes
- kiss - kisses
- wish - wishes
- go - goes
- do - does
3. With verbs ending in "consonant + y", we change the -y to -i and add -es.
- cry - cries
- carry - carries
- deny - denies
- fly - flies
- hurry - hurries
- reply - replies
- study - studies
- worry - worries
But we do not follow the above rule if the form is "vowel + y":
- stay - stays
- play - plays
- betray - betrays
- decay - decays
