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While I ought not to make such a statement without having a reference work
to consult handy, I have always found the forms of GI(G)NOMAI used where an
aorist of EIMI is wanted. The fact that EIMI has only the present
(durative, continuous) aspect is precisely the reason why Parmenides was
able to use forms of the verb EIMI to "prove" that time and motion are
illusory.