Me too, So do I, So am I. . Those are used as short statements to show we share the same (positive)circumstances with the previous statement. . If there is "be" (am/is/are) in the sentence, you should reply with "so am I". . If there is verb without 'be verb' in the sentence, you should use "so do I". . I am tired. - Me too. (auxiliary - the verb "to be" ) - So am I. I ate too much. - Me too. (auxiliary - did) - So did I. I' ve got new shoes. - Me too. (auxiliary - have) - So have I. I want to eat. - Me too. (auxiliary - do) - So do I. . If the sentences were negative, then we would use neither/nor. . I am not tired. - Me neither. - Neither/Nor am I. . You can also take the approach elegant: . I am hungry - As am I. He already ate - As did I. . Try To Make Example Sentences.