Screeve question

To whoever may have the info:

  For the two languages I'm forcing myself to work more on, I want to use
a "screeve" system like Georgian does. I understand that these "screeves"
combine some features of tense and aspect. And I like how not
every 'aspect' is available to each 'tense', and thus the "screeve" system
is nicely messier than a straightfoward tense/aspect "grid" might be. But I
don't really understand how they work! There are some Georgian grammar
sites out there; one in particular is very large and shows how to *form*
each screeve but has little information on the *use* of each one.
  Can someone tell me more about how the Georgian "screeves" (or a conlang
with a similar screeve system) are used?

M

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