talk to / talk with

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. have no one to talk to.
    1a. I have no one to talk with.
    1b. I have no one to talk.
  2. I want that box to keep my books.
    2a. I want that box to keep my books in.
  3. I have no business to attend.
    3a. I have no business to attend to.
    Please correct the above sentences.
    Thanks.
2

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.