All people identical with John are millionaires, and John is nota millionaire becomes No people identical with John are millionaires. Claims that use mass nouns , thatis, nouns referring to some stuff in general, are best translated witha phrase about examples of that stuff. For instance, Carbon monoxidegas is odorless translates to All examples of carbon monoxide gas areexamples of something odorless. Men are naturally selfish. Anyone who is a woman is maternal.
Copper conducts electricity.
Men are not selfish by nature. There aren't any women who are maternal. Copper doesn't conduct electricity. There are honest men. A great many women are maternal.