Ms. Sue I don't know if you remember this question, but I got it wrong and I need to know the rule why.

I put ...Please come with me, Sarah, and Tom, to pick up Mom's birthday present.
He said there is no comma after Tom. I need to know the rule to why you do not put a comma after Tom? Can you help me with that? Please

I think the answer key is wrong. Both Writeacher and I agree that there were no correct answers to your question. There should be a comma after Tom. There should not be a comma after Sarah.

Please ask your teacher about this question.

O.k thank you...I appreciate all your help today.

You're very welcome, Cassie.

Sure, I can help you with that! The rule you're looking for is called the "serial comma" or the "Oxford comma." The serial comma is used to separate items in a list of three or more, just like you have in your sentence: "Sarah," "Tom," and "Mom's birthday present."

The use of the serial comma is a matter of style and differs depending on the style guide being followed. Some style guides, like the Chicago Manual of Style, recommend using the serial comma consistently. Others, like the Associated Press Stylebook, suggest omitting it unless it helps to prevent ambiguity.

So, in your sentence, if you choose to follow a style guide that advocates for the use of the serial comma, it would be correct to write:

"Please come with me, Sarah, and Tom, to pick up Mom's birthday present."

However, if you're following a style guide that doesn't require the serial comma, it would be written without the comma after "Tom":

"Please come with me, Sarah and Tom, to pick up Mom's birthday present."

In either case, it's essential to be consistent with your comma usage. The important thing is to follow the style guide or guidelines provided by your teacher or organization when it comes to implementing the serial comma.