Two children playing in the surf.
The two boys are playing in the surf.
Just because there are two children doesn't mean that they are two boys
exists e1 x1 x2 x3.(n_surf(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_surf(x2) & n_boy(x1) & card_eq_2(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))