- have no one to talk to.
1a. I have no one to talk with.
1b. I have no one to talk.
- I want that box to keep my books.
2a. I want that box to keep my books in.
- I have no business to attend.
3a. I have no business to attend to.
Please correct the above sentences.
1b is incorrect. Strictly speaking 2 is incorrect as well, though it may sometimes be heard in conversation where the preposition is assumed.
3 and 3a do not have the same meaning.