Thank you very much for your corrections. Here are some more sentences for you to check.

1)The narrator is the voice who tells the story and from whose point of view the story is told.
2)He may be internal to the story, that is, a character in the story, either the protagonist or a witness.
3)He may also be external to the story and tells events he has not taken part in.
4) The first-person narrator is a character in the story. He may be either the protagonist or a minor character.
5) The choice of this narrator can have the following functions. First, it brings reader close to the feelings of the narrator.Then, it contributes to conveying an impression of reality and it restricts the reader’s point of view.

1 - 4 = OK

5 - What does "it" refer to in the second and third sentences?

Here are the corrections for the sentences:

1) The narrator is the voice that tells the story and through whose point of view the story is told.
2) The narrator can be internal to the story, meaning they are a character in the story, either the protagonist or a witness.
3) The narrator can also be external to the story and narrate events in which they have not taken part.
4) A first-person narrator is a character in the story, who can be either the protagonist or a minor character.
5) The choice of this narrator can serve various functions. First, it allows the reader to closely experience the emotions of the narrator. Second, it contributes to creating a sense of reality in the story. Lastly, it limits the reader's perspective to that of the narrator.

Here are the corrected sentences:

1) The narrator is the voice that tells the story and from whose point of view the story is told.
2) The narrator may be internal to the story, meaning they are a character in the story, either the protagonist or a witness.
3) The narrator may also be external to the story and describe events they have not taken part in.
4) A first-person narrator is a character in the story. They may be either the protagonist or a minor character.
5) The choice of this narrator can serve several functions. First, it helps the reader connect with the feelings of the narrator. Second, it contributes to creating a sense of reality in the story. Finally, it limits the reader's perspective by presenting events through the narrator's point of view.