(Ara) Fix QuestSlash so preposition shows up in the right place

Add comments/instructions to other functions that use complClSlash

src/arabic/QuestionAra.gf

@@ -38,12 +38,12 @@ concrete QuestionAra of Question = CatAra ** open ResAra, ParamX, Prelude, VerbA
 
    CompIAdv iadv = { s = \\_ => iadv.s ; a = ResAra.Sg } ;
 
-   --  QCl = {s : Tense => Polarity => QForm => Str} ;
-   QuestSlash ip cls = { ----IL just guessing
-      s = \\t,p,qf =>
-        let cl : ResAra.Cl = complClSlash cls ; -- dummy conversion to Cl
+   -- : IP -> ClSlash -> QCl ; -- whom does John love
+  QuestSlash ip cls = {
+    s = \\t,p,qf =>        -- remove cls's c2 so it won't show up in the wrong place
+        let cl : ResAra.Cl = complClSlash (cls ** {c2=noPrep});
             o = toOrder qf
-          in cls.c2.s ++ bindIf cls.c2.binds
+          in cls.c2.s ++ bindIf cls.c2.binds -- Put cls's c2 ("with") before the IP ("whom")
           ++ ip.s ! False ! Masc ! Def ! Nom
           ++ cl.s ! t ! p ! o
       } ;

src/arabic/ResAra.gf

@@ -664,13 +664,13 @@ oper
     s = \\_pgn,vf => v.s ! np.a.pgn ! vf -- so we can throw away subject's pgn
     } ;
 
-  -- TODO: what to do with vp.c2 if there is no object /IL
   complClSlash = overload {
     complClSlash : NP -> ClSlash -> Cl = \obj,cls ->
       predVP (subj2np cls.subj) (insertObj obj cls) ;
     complClSlash :       ClSlash -> Cl = \cls ->
       predVP (subj2np cls.subj) (insertObj emptyNP cls) -- Empty subject and object
-    } ;
+    } ; -- If VP has a c2, its placement should be handled in the function that calls complClSlash.
+        -- See QuestSlash (in QuestionAra) for an example.
 
   Cl  : Type = {s : Tense => Polarity => Order => Str} ;
   QCl : Type = {s : Tense => Polarity => QForm => Str} ;

src/arabic/SentenceAra.gf

@@ -66,7 +66,9 @@ concrete SentenceAra of Sentence = CatAra ** open
 
     UseRCl t p cl = {s = \\agr,c => t.s ++ p.s ++ cl.s ! t.t ! p.p ! agr ! c} ;
 
-    UseSlash t p cl = UseCl t p (complClSlash cl) ;
+    -- If the cls has a c2, the preposition will just hang there without an object.
+    -- If this bothers you, call complClSlash to cls ** {c2=noPrep}. /IL
+    UseSlash t p cls = UseCl t p (complClSlash cls) ;
 
     AdvS adv s = s ** {s = \\o => adv.s ++ s.s ! o} ;
 }