...he submitted, and so did I. (I think this is definetly ok) ...he submitted, and I did too. (I think this too is ok) ...he submitted, and me too. (Not sure it's ok, I'd say it's strange) ...he submitted... me too. (Not sure it's ok if the same person says both "he submitted" and "me too". I think it's fine if "me too" is said by anoth