Now if in that case anyone, after granting that it is not possible to do and to have done the same thing at the same time, were to say that it is possible to see and to have seen, still he has not yet been refuted, if he says that to see is not a form of doing but of passivity; for this question is required as well, though he is supposed by the listener to have already granted it, when he granted that to cut is to do something, and to have cut to have done something, and so on with the other things that have a like expression.