What are the four characteristics of pronouns?

It's not quite accurate to say pronouns have just "four characteristics." They have many characteristics, depending on how you categorize them. However, here are four key aspects of pronouns that are often discussed:

1. Person: This refers to who is speaking (first person - I, we), who is being spoken to (second person - you), or who is being spoken about (third person - he, she, they, it).

2. Number: This refers to whether the pronoun is singular (I, you, he, she, it) or plural (we, you, they).

3. Gender: This refers to whether the pronoun is masculine (he, him, his), feminine (she, her, hers), neutral (it, its), or gender-neutral (they, them, their).

4. Case: This refers to the grammatical function of the pronoun in a sentence. There are three main cases:

* Nominative: The pronoun is the subject of the verb (e.g., *I* went to the store).

* Objective: The pronoun is the object of the verb or preposition (e.g., She gave it to *me*).

* Possessive: The pronoun shows ownership (e.g., *My* book is on the table).

It's important to note that not all pronouns have all these characteristics. For example, "it" is gender-neutral and doesn't change form depending on case.

Let me know if you'd like more detail on any of these aspects!