Which sentence contains a participle functioning as an adjective?

1. Katrina is wandering around the school looking for her brother.
2. Mr. Wallace is meeting the principal to discuss the exam schedule
3. The swimming pool in my neighborhood is close for the winter
4. The teacher is grading papers at her desk

3. The swimming pool in my neighborhood is closed for the winter.

The sentence that contains a participle functioning as an adjective is:

3. The swimming pool in my neighborhood is closed for the winter.

To identify the sentence that contains a participle functioning as an adjective, we need to understand what a participle is and how it functions.

A participle is a verb form that can function as an adjective by modifying a noun or pronoun. Participles often end in -ed, -en, -ing, or -t, and they describe or provide additional information about the noun or pronoun they modify.

Let's analyze each option:

1. "Katrina is wandering around the school looking for her brother."
In this sentence, the word "looking" is a present participle that describes what Katrina is doing. It functions as an adjective, modifying the noun "Katrina."

2. "Mr. Wallace is meeting the principal to discuss the exam schedule."
In this sentence, there are no participles functioning as adjectives. The verb forms "meeting" and "discuss" are not acting as adjectives but rather as verbs in the sentence.

3. "The swimming pool in my neighborhood is closed for the winter."
In this sentence, the word "closed" is a past participle that modifies the noun "pool." It describes the state or condition of the pool. Therefore, it functions as an adjective.

4. "The teacher is grading papers at her desk."
In this sentence, there are no participles functioning as adjectives. The verb form "grading" is acting as a verb, not an adjective.

Based on this analysis, the sentence that contains a participle functioning as an adjective is option 3: "The swimming pool in my neighborhood is closed for the winter."