A person is running across a desert.
The person is looking for water.
The person may just be running, not looking for water.
exists e1 x1 x2.(across(e1,x2) & n_desert(x2) & Actor(e1,x1) & v_run(e1) & n_person(x1))
exists e1 x1 x2.(n_person(x1) & for(e1,x2) & n_water(x2) & Actor(e1,x1) & v_look(e1))