The correct answer is ❓ We say: She wrote the report by herself. By herself means she did it alone, without help. description long details This sentence uses a common expression. By myself, by yourself, by himself, by herself all mean alone. They show that no one helped with the action. With would mean using help or tools. For shows purpose or benefit. To does not fit this structure. More examples. He fixed the computer by himself. I traveled by myself last year. She learned English by herself.