this := lexeme &
[ ORTH "this",
  CATEGORY det ].

these := lexeme &
[ ORTH "these",
  CATEGORY det ].

sleep := lexeme &
[ ORTH "sleep",
  CATEGORY vp ].

sleeps := lexeme &
[ ORTH "sleeps",
  CATEGORY vp ].

dog := lexeme &
[ ORTH "dog",
  CATEGORY n ].

dogs := lexeme &
[ ORTH "dogs",
  CATEGORY n ].