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Contain the writers feelings
In Tim O'Briens chapter good form, the narrator says he wants his readers to feel WHAT HE FELT.
Even though I haven't read the whole story, I think he is using the first person point of view in telling his story. This is because in using the first person point of view, readers will be able to put themselves in the narrator's shoes and experience what is happening in the story.
Answer:
Here's some examples, you can switch it up or around to how you see fit
Explanation:
She was rather envious, while her sister was warmhearted.
One of the sisters was envious and cold, and (or while) the other was warmhearted and kind.
Her sister was envious, but she was warmhearted.