* is copula / is have_V2 / is neither
There is no difference; all three options are is mutually exclusive.
There 2 params in the first place only by accident. First one was added
by AED 10 years agon, second by me only some weeks ago, without thinking
that the params are mutually exclusive.
Also tested with gftest, no difference found after 2 hours of running.
ImpersCl (VP -> Cl) used to check whether the VP is predicative, and
in the positive case, force the dummy subject to not be a pronoun.
This has been wrong since the time I changed prodrop rules in PredVP.
The error that followed manifested when the Cl was put in subordinate
position: the subject pronoun did not attach to the conjunction.
An example follows.
Lang: SubjS that_Subj (UseCl (TTAnt TPres ASimul) PPos (ImpersCl (UseComp (CompNP (DetCN (DetQuant IndefArt NumSg) (UseN girl_N))))))
LangEng: that it is a girl
Old LangAra: أنَّ ها بِنتٌ (wrong)
New LangAra: أنَّ &+ ها بِنتٌ (correct)
