"I now know (that's something new) that she now knows (yes, he knows, too)..." 'Cognoscere' Conjugational: A Constrained Nonsense in Rhyme

I now know 
(that’s something new)
that she now knows 
(yes, he knows, too)
that we now know 
(as knows my gnu)
that they now know -- 
as so do you.
Your crew now knows – 
of course you do --
that it now knows. 
(Is ‘it’ a ‘who’?)
Now, lest is risked 
more déjà vu,
this conjugational's 
through, nu?