a young redheaded boy walking in the grass.
There is a boy in the grass.
A boy walking in the grass means a boy is in the grass.
exists s1 s2 x1 x2 x3.(n_grass(x3) & a_topic(x1) & in(x1,x3) & n_walking(x1) & of(x1,x2) & n_boy(x2) & a_redheaded(s2) & Theme(s2,x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_grass(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_boy(x2)))