Question

When to use have and has​

Answer 1

When to use have?
•speaking in the first person (I, we)
•speaking in the second person (you)
•speaking in the third person plural (they)

When to use has?
•speaking in the third person singular (he, she, and it).

Answer 2

Has is the third person singular present tense of have. This just means that it is used when you are speaking in the third person singular, i.e., with the pronouns he, she, and it.