The tan dog in a black collar runs across a field.
The dog is chasing a rabbit.
A dog running across is not necessary to be chasing a rabbit.
exists e1 s1 s2 x1 x2 x3.(n_dog(x1) & a_tan(s1) & Theme(s1,x1) & across(e1,x3) & n_field(x3) & Actor(e1,x1) & v_run(e1) & in(x1,x2) & n_collar(x2) & a_black(s2) & Theme(s2,x2))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_rabbit(x2))