Infinitive verb (+s)
I / you / we / you / they ⮕ walk
He / she / it ⮕ walks
SHIT-rule exceptions
Verb ending in consonant + y ⮕ replace –y with –ies
Verb ending in vowel* ⮕ add –es
Verb ending in –s, –z, –sh, –ch and –x ⮕ add –es
*Vowels: a, e, i, o, u
Consonants: all other letters