"I didn't know that..."

Given statement X which is a true statement that continues to be true
in the present time, what tense/mood/verb form would your lang use in
X in the equivalent of "I didn't know X"?

AFAICT, Englishhas somewhat free variation between the past and
present indicative here, although the present is only an option when
the statement continues to be true.  Spanish (and, I suppose, other
romlangs) uses the present subjunctive, which seems odd since it's not
a counterfactual statement.  I'm interested in other natlang examples
as well as conlang ones, since I'm trying to decide how to handle this
case...



--
Mark J. Reed <markjreed@...>