Two boys play in the sand
A girl watches a bird.
The two boys are not the same as a girl. They are playing in the sand and not watching a bird.
exists e1 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_bird(x2) & n_girl(x1))