The links between verb positions, empty slashes, pragmatic force and
clause types reminds me of Richter (1997), which looks quite similar
in its HPSG rendering in many respects, and argues very similar points
throughout (the theory of German sentence structure of
Richter & Sailer 2001 is an updated version thereof, but it omits
the connection to clause types at issue here, adding morphological
considerations and LRS semantics instead).
p. 102
To do.