The horse on the left is brown.
There is a brown horse.
The horse there is a brown horse
exists s1 x1 x2.(n_left(x2) & n_horse(x1) & Theme(s1,x1) & a_brown(s1) & on(x1,x2))
exists p1 x1 s1 x2.((x1 = x2) & n_horse(x2) & a_brown(s1) & Theme(s1,x2))