<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["en", "en"].<end_of_turn>
<start_of_turn>user
When do you use "who" vs. "that" in relative clauses?<end_of_turn>
<start_of_turn>model
Use "who" for people and "that" for animals or things in defining relative clauses.

Use "who" when:
The clause refers to a person or group of people.
The clause is essential for defining the noun it modifies (restrictive clause).

Examples:
The person who helped me is a volunteer. (restrictive)
I wonder who ate the last cookie. (non-restrictive)
The team who won the championship celebrated all night. (restrictive)

Use "that" when:
The clause refers to a thing, animal, or idea.
The clause is non-essential and could be omitted without affecting the meaning of the sentence (non-restrictive clause).

Examples:
The book that I read yesterday was fascinating. (non-restrictive)
The dog that chased the cat is very playful. (non-restrictive)
The theory that was proposed is still being debated. (non-restrictive)<end_of_turn><eos>