What is a good sentence for a indefinite pronoun with an antecedent?

Indefinite pronoun sentences with antecedents:

1. You can have vanilla or lemon, or you can have both.
2. I found one but I can't find the other.
3. I invited the twins but neither can come.
4. The children will all want to go.
5. I saw cute puppies in the window, so I bought one.

Indefinite pronoun sentences with no antecedents:

1. Everyone left at nine.
2. Would you like some?
3. I didn't see anyone I knew.
4. There isn't any left.
5. I knew that something was wrong.