Which sentence is grammatically correct?

1) She should of typed the report.
2) Would you get a pencil off her?
3) This is just between you and I.
4) The new salesclerk waited on me,.

2 answers

None are correct. If you take care of a punctuation issue in #4, you might be able to reconsider.
1) -- should HAVE
2) pencil FROM her
3) between you and ME
4) correct