;;; Lexicon
this := sg-word &
[ ORTH "this",
  CATEG det ].

these := pl-word &
[ ORTH "these",
  CATEG det ].

the := word &
[ ORTH "the",
  CATEG det ].

sleep := pl-word &
[ ORTH "sleep",
  CATEG vp ].

sleeps := sg-word &
[ ORTH "sleeps",
  CATEG vp ].

dog := sg-word &
[ ORTH "dog",
  CATEG n ].

dogs := pl-word &
[ ORTH "dogs",
  CATEG n ].

sheep := word &
[ ORTH "sheep",
  CATEG n ].

slept := word &
[ ORTH "slept",
  CATEG vp ].