Explain the usage of their, there, and they're.

The words "their," "there," and "they're" are homophones, which means they sound the same but have different meanings and spellings. Understanding their correct usage is essential to avoid confusion in writing. Let's break down the usage of each word:

1. "Their" is a possessive pronoun that shows ownership. It is used to indicate that something belongs to a group of people or individuals. For example:
- "The students forgot their books in the classroom."
- "The family went on vacation with their dog."

2. "There" is an adverb that indicates a place or location. It is used to point out or refer to a specific position or direction. For example:
- "The park is over there."
- "She left her keys there on the table."

3. "They're" is a contraction of the words "they" and "are." It is used to combine the subject pronoun "they" with the verb "are." For example:
- "They're going to the movies tonight."
- "I heard they're planning a surprise party."

To avoid confusion, it is crucial to use these words correctly in writing. Here are a few tips to remember:

- If you are referring to possession, use "their."
- If you are indicating a place or location, use "there."
- If you are combining the subject pronoun "they" with the verb "are," use "they're."

Remember to proofread your writing carefully to ensure you have used the correct word. Additionally, it can be helpful to read your sentences aloud to check if they make sense and convey the intended meaning.