Day 10: Subjects and verbs must agree in person.
Few writers would write “Bob love tuna sandwiches.” They would write “loves.”
In the present tense, if the subject of a verb can be replaced by he, she, or it, the verb probably needs that final “s.” Because the name “Bob” can be replaced by he, the verb needs that “s.”
When you write in the present tense, find your verbs. Then find the subject of those verbs. If you can replace them with one of these three pronouns, the verb probably needs that “s.”