I always have trouble with this one. I often add the word "too" at the end of a sentence, but I get confused on whether a comma is needed or not. Is it ever needed? I was never taught that a comma was needed before a "too" at the end of a sentence, but is it okay to put a comma before that "too" in some cases? Example 1: Everyone has his best friend, and I do too. <-- No comma needed. Example 2: I love teddy bears, too! <-- Comma needed? If the comma is unnecessary, is it still grammatically acceptable? Can anyone clarify for me when it's necessary, acceptable, etc to use a comma before this short adverb?