Add -s to the base form for regular verbs.
"He plays football every day."
Add -es to verbs ending in -ch, -sh, -ss, -x, -o
Verbs ending in these sounds take -es for smoother pronunciation.
"He watches TV after work."
Change -y to -ies for verbs ending in consonant + -y
Change the -y to -ies when a consonant precedes the -y.
Keep -y and add -s for verbs ending in vowel + -y
Keep the -y and just add -s if a vowel precedes the -y.
Some verbs have irregular forms in the third person.