Two guys breakdance on stage.
Two men are dancing.
Not all guys are men - they could be boys.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_stage(x3) & n_breakdance(x1) & of(x1,x2) & n_guy(x2) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_dance(e1) & n_man(x1) & card_eq_2(x1))