A dog runs in a field.
A dog chases after a boy in the field
Just because a dog runs in a field it does not mean the dog chases a boy.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2 x3.(n_field(x3) & after(e1,x2) & in(x2,x3) & n_boy(x2) & Actor(e1,x1) & v_chase(e1) & n_dog(x1))