I've been scouring the Internet, but to no avail. Could you please tell me when/if "too" should be preceded by a comma at the end of a sentence?
I looked for the answer in a book, and I looked on the Internet, too.
Is this second comma necessary?
A: I'm hungry.
B: I am too.
Should there be a comma in the above response?
If you could answer these questions and give an explanation as to when it is appropriate to use a comma with the word "too", I would be very grateful. If possible, I'd also like to know why the comma is/isn't used.