A man stands guard overlooking a lake.
A lifeguard stands waiting for danger.
Just because a man stands guard by a lake does not mean that he is a lifeguard.
exists e1 e2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_overlook(e2) & n_lake(x3) & Time(e1,x2) & n_guard(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e1 e2 x1 x2.(for(e1,e2) & for(e2,x2) & n_danger(x2) & Actor(e2,x1) & v_wait(e2) & Actor(e1,x1) & v_stand(e1) & n_lifeguard(x1))