As I listened to Carlos, I pictured myself at the fair in St. Louis.

• common noun
• proper noun
• compound noun
• collective noun

St. Louis (proper noun)

In the sentence "As I listened to Carlos, I pictured myself at the fair in St. Louis," the words can be categorized as follows:

• common noun: fair
• proper noun: Carlos, St. Louis
• compound noun: N/A (no compound nouns in this sentence)
• collective noun: N/A (no collective nouns in this sentence)

To identify the types of nouns in the sentence, let's break it down:

1. Common noun: A common noun is a general name for a person, place, thing, or idea. In this sentence, the word "fair" is a common noun because it refers to a general event or gathering.

2. Proper noun: A proper noun is the name of a specific person, place, or thing. In this sentence, "Carlos" is a proper noun because it is a specific person's name. "St. Louis" is also a proper noun because it is the name of a specific city.

3. Compound noun: A compound noun is formed when two or more words are combined to create a new noun. In this sentence, there are no compound nouns.

4. Collective noun: A collective noun refers to a group or collection of people or things. There are no collective nouns in this sentence.

So, to summarize, the types of nouns in the sentence are:

- Common noun: fair
- Proper nouns: Carlos, St. Louis