A girl and boy look at each other.
A boy and girl are looking at each other.
Both sentences have a girl and a boy only the second sentence has them in reverse.  If they look then they are looking.
exists x1 x2 x3.(all x4.(n_other(x4) -> (a_topic(x1) & at(x1,x4))) & n_look(x1) & of(x1,x3) & n_boy(x3) & of(x1,x2) & n_girl(x2))
exists e1 x1 x2 x3.(all x4.(n_other(x4) -> at(e1,x4)) & Actor(e1,x1) & v_look(e1) & n_girl(x3) & n_boy(x2) & subset_of(x3,x1) & subset_of(x2,x1))