What about modal verbs?
From
Denis Mosko@2:5064/54.1315 to
All on Sunday, April 26, 2020 18:26:56
Can, could, will, would, ought to, should, must, may, might, need, shall.
Tableau:
Simple Modal + be
Continous Modal verb + be being
Perfect Modal verb + have been
Perfect continous Modal verb + have been being
Just like in future tenses!
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* Origin: ;) (2:5064/54.1315)