\input eplain
\input avm.sty
\input pst-tree
\psset{levelsep=*0.5in, treesep=0.75cm}
\font\sf = cmbr10
\font\sfi = cmbrsl10
\font\sssc = cmtl10
\font\edh = tipasl10
\font\rm=cmbr10
\font\it=cmbrsl10
\avmfont{\sssc}
\avmvalfont{\sf}
\avmsortfont{\sfi}
\avmoptions{center}
\parindent = 0 pt
\parskip = 12 pt
\rm
\magnification=715
\nopagenumbers
\special{papersize=11in, 8.5in}
\paperwidth=11in
\paperheight=8.5in

\pstree{\TR{%
%
\avm\[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & fin \cr AUX & +\]
\cr VAL & \<~\> \]\endavm
%
}}{\pstree{\TR{%
%
\avm\@1\[\sfi phrase \cr HEAD & \[POS & n \cr NMORPH & norm\] \cr VAL
& \<~\>\]\endavm
%
}}{\TR{he}}\pstree{\TR{%
%
\avm\[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & fin \cr AUX & +\]
\cr VAL & \<\@1\>\]\endavm
%
}}{\pstree{\TR{%
%
\avm\[\sfi word \cr HEAD & \[POS & v \cr VMORPH & fin \cr AUX & +\]
\cr VAL & \<\@1, \[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & bse\]
\cr VAL & \<\@1\>\]\>\]\endavm
%
}}{\TR{should}}\pstree{\TR{%
%
\avm\[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & bse \cr AUX & +\]
\cr VAL & \<\@1\>\]\endavm
%
}}{\pstree{\TR{%
%
\avm\[\sfi word \cr HEAD & \[POS & v \cr VMORPH & bse \cr AUX & +\]
\cr VAL & \<\@1, \[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & psp\]
\cr VAL & \<\@1\>\]\>\]\endavm
%
}}{\TR{have}}\pstree{\TR{%
%
\avm\[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & psp \cr AUX & +\]
\cr VAL & \<\@1\>\]\endavm
%
}}{\pstree{\TR{%
%
\avm\[\sfi word \cr HEAD & \[POS & v \cr VMORPH & psp \cr AUX & +\]
\cr VAL & \<\@1, \[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & prp\]
\cr VAL & \<\@1\>\]\>\]\endavm
%
}}{\TR{been}}\pstree{\TR{%
%
\avm\[\sfi phrase \cr HEAD & \[POS & v \cr VMORPH & prp\] \cr VAL &
\<\@1\>\]\endavm
%
}}{\TR{watching}}}}}}

(1) He should have been watching.

\bye