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,.

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

The grammatically correct sentence is:

4) The new salesclerk waited on me.

The grammatically correct sentence is:

4) The new salesclerk waited on me.

To determine the correct sentence, we need to analyze each option:

1) "She should of typed the report."
This sentence is incorrect. It contains a common error known as "should of," which is a mistaken homophone of "should have." The correct phrase here is "should have," so the sentence should be:

"She should have typed the report."

2) "Would you get a pencil off her?"
This sentence is grammatically incorrect. The correct preposition to use here is "from" instead of "off." So, the corrected sentence would be:

"Would you get a pencil from her?"

3) "This is just between you and I."
This sentence is grammatically incorrect. In this case, the pronoun "I" should be the object form "me," as it follows the preposition "between." To correct the sentence, you should say:

"This is just between you and me."

4) "The new salesclerk waited on me."
This sentence is grammatically correct. The verb "waited on" is used correctly, and the pronoun "me" is the correct object form.

Therefore, the correct sentence is:

4) The new salesclerk waited on me.