A person on their knees looking for something.
A person lost their keys and are looking for it.
Not everything that someone is looking for has lost their keys.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & for(e1,x4) & n_thing(x4) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_knee(x2) & of(x2,x1) & n_thing(x1) & n_person(x1))
exists e2 e1 x1 x2 x3.(for(e2,x1) & n_thing(x1) & n_thing(x1) & Actor(e2,x3) & v_look(e2) & n_person(x3) & Theme(e1,x2) & Actor(e1,x1) & v_lose(e1) & n_key(x2) & of(x2,x1) & n_person(x1))