Here are the rewritten sentences using "so," "too," "either," and "neither":

1. I have told you, and **so has your father**.
2. She hasn’t bought a glass of water, and **neither have you**.
3. What you eat is healthful, and **so is what you drink**.
4. None of my friends has come, and **neither have you**.
5. She can never drive a car, and **neither can my mother**.
6. I don’t think you can do it, and **neither can my mother**.
7. My mother thinks they will come soon, and **so do I**.
8. What he has done is encouraging, and **so is your work**.
9. The reason why he has passed the exam is unknown, and **so is the reason for me**.
10. We like him, and **so do you**.