Do you change them to the or those? I think it is the, but I am not sure.

Later we cooked them fish and talked about the excitement of the day.

Either "the" or "those" will be correct.

I was marked incorrect for using the. Any ideas?

those

You said either "the" or "those" would be correct. Why was I be marked wrong for using "the"?

I don't know. Either one is correct. "Them" is clearly not correct! But if your teacher has marked "the" incorrect, then choose "those."

To determine whether to use "the" or "those" in this context, you need to consider the context and the specific noun being referred to.

In the given sentence, the pronoun "them" is being used to refer to something previously mentioned or understood. Without further context, it is unclear what "them" is referring to. However, let's assume that "them" is referring to a specific group of fish that were mentioned earlier in the conversation.

When referring to specific, previously mentioned objects, we typically use "the" instead of "those." Therefore, the correct sentence would be:

"Later we cooked them the fish and talked about the excitement of the day."

In this sentence, "the" is used to indicate that the fish being cooked are a specific group of fish that were previously mentioned or understood by both the speaker and the listener.