1. She's from Da Nang, and my friend too is
⇒She's from Da Nang, and my friend is, too
2. We aren't rich. They aren't too
⇒We aren't rich. They aren't, either
3. Brian doesn't play volleyball. I do either
⇒Brian doesn't play volleyball. I don't either
4. Jane doesn't drive to work, and her brother doesn't neither
⇒Jane doesn't drive to work, and her brother doesn't, either