a young redheaded boy walking in the grass.
The boy is walking by himself.
A young redheaded boy walking in the grass is not necessarily walking by himself.
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 e1 x1.(n_male(x1) & n_boy(x1) & by(e1,x1) & Actor(e1,x1) & v_walk(e1))