Anonymous He does things better than I do He dances better than I do (or I am?? ) The auxiliary for those verbs would be DO, so you need that, and not the verb TO BE. Anonymous He is taller than I am.
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AnonymousHe does things better than I doThe auxiliary for those verbs would be DO, so you need that, and not the verb TO BE.
He dances better than I do(or I am??)
AnonymousHe is taller than I am.Here the auxiliary is TO BE (He is taller...), so using the sentence above is fine.