 By contrast yet again and finally, the three kinds of modality of a judgment are supposed by Kant to capture the three basic ways in which the copula of a simple 1-place subject-predicate proposition “contributes nothing to the content of the judgment … but rather concerns only the value of the copula in relation to thinking in general” (A74/B99–100). This doctrine might seem to confuse the three propositional attitudes of “opining” (Meinen), epistemic belief, and certainty (A820–823/B848–851), as discussed in the supplementary document  Judging, Believing, and Scientific Knowing,  with the alethic modal notions of possibility, actuality, and necessity. Or even worse, it might seem to psychologize modality.