We have looked at a lot of English grammar. Let's make sure you know it before jumping into cases.

1. A noun is a word that describes a person, place, or thing.

2. A pronoun is a word that stands in place of a noun. That word is called the antecedent. If the antecedent refers to a person, then the pronoun is a personal pronoun.

3. Words are singular (referring to one) or plural (referring to more than one). This is called number and is an example of inflection.

4. Nouns (as well as pronouns and adjectives) have gender. This means they are either masculine, feminine, or neuter.

5. Nouns are third person.

6. Pronouns generally change their form based on their gender. They follow natural gender. A few other words do as well. This is another example of inflection.