A dog runs through a field.
The dog is running for a stick.
A dog running through a field is not necessarily running for a stick.
exists e1 x1 x2.(through(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(n_dog(x1) & for(e1,x2) & n_stick(x2) & Actor(e1,x1) & v_run(e1))