Philosophers distinguish three senses of "is": - Identity: "Clark Kent is Superman." Anything true of Superman is true of Clark Kent and vice versa, since thes

Philosophers distinguish three senses of "is": - Identity: "Clark Kent is Superman." Anything true of Superman is true of Clark Kent and vice versa, since these are two names for the same thing. - Predication: "Superman's cape is red." Red is a quality of the cape. It's not reflexive because not all red things are capes. - Existence: "There is no Superman." In English, existence sentences usually begin with "there is" or more poetically, you say "Superman is ~not~." Existence is not a relation. In the case of Clinton, he was being evasive about "is" versus "was" in the time dimension. There was a sexual relationship between him and Lewinski, but he called there "is" no relationship in general.