Two adults stand up on a bus and watch out the front window.
Two men are looking for somebody outside of the bus.
Watching out of the bus may be for many reasons, not only looking for somebody.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(n_window(x4) & of(x4,x5) & n_front(x5) & a_out(s2) & Manner(e2,s2) & Theme(e2,x4) & Actor(e2,x3) & v_watch(e2) & n_adult(x3) & card_eq_2(x3) & on(e1,x2) & n_bus(x2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_adult(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_bus(x4) & for(e1,x2) & of(x3,x4) & outside(x2,x3) & n_thing(x3) & n_person(x2) & Actor(e1,x1) & v_look(e1) & n_man(x1) & card_eq_2(x1))