A dog runs in a field.
A dog is chasing his tail in a field.
Just because a dog runs it does not mean he is chasing his tail.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_field(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_tail(x2) & of(x2,x1) & n_male(x1) & n_dog(x1))