What are first, second, and third person?
These are the types of personal pronouns.

What is the difference between first, second, and third person?
Grammarians have classified human beings, animals, and things into seven categories.
They are: I, we, you, he, she, it, and they.
"I, we, our" are called first person __________.
"You" is called Second Person Singular and Plural.
"He, she, it" are called Third Person Singular.
"They" is called Third Person Plural.
What are the types of first, second, and third person?
Subject Object Reflexive
I me myself
we us ourselves
you you yourself
you you yourselves
he him himself
they them themselves
she her herself
it it itself

Subject and object is essential in this.
Reflexive is also one form of pronoun.

Where do you classify their and there?
"Their" is a pronoun.
"There" can be used as a noun or adverb.

Does "their" belong to third person plural?

Is a sentence starting with the name of a person first, second, or third person, or none of them?

When do we start a sentence with the name of a person?

How many types of sentences can you make starting with the name of a person?
You should be able to make at least twelve different sentences.

How do you write a declarative sentences using the first person I, me, my, we, our? The second person you and your? The third person he, she, it, they, their, his, hers, him, her?
In grammar, the form of a verb is determined by whether its subject is first, second, or third person and either singular or plural.

How many tenses can you make with each word?
Can you make twelve tenses from each word?

Personal Pronouns - Nominative (Subjective)
The nominative pronouns are used in the subject of a sentence.

Example: You have a book.

Person,number Nominative
1st,singular I
2nd,singular you
3rd,singular he, she, it
1st,plural we
2nd,plural you
3rd,plural they

Personal Pronouns - Objective
Objective pronouns are used in the object of a sentence.

Example: Give me the book.

Person,number Objective
1st,singular me
2nd,singular you
3rd,singular him, her
1st,plural us
2nd,plural you
3rd,plural them

Personal Pronouns - Possessive adjectives (Genitive)
Possessive adjectives are sometimes called attributive possessive pronouns. They generally modify noun phrases.

Example: This is my book.

Person,number Possessive adjectives
1st,singular my
2nd,singular your
3rd,singular his, her
1st,plural our
2nd,plural your
3rd,plural their

Personal Pronouns - Possessive
Possessive pronouns are nominal in nature and they occur in the object of a sentence.

Example: This book is mine.

Person,number Possessive pronouns
1st,singular mine
2nd,singular yours
3rd,singular his, hers
1st,plural ours
2nd,plural yours
3rd,plural theirs