Two boys playing in the sand.
a pair of boys are enjoying the sand
Two is a pair and if they are playing in the sand it means they are enjoying the sand.
exists e1 x1 x2 x3.(n_sand(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_sand(x3) & Theme(e1,x3) & Actor(e1,x1) & v_enjoy(e1) & of(x1,x2) & n_boy(x2) & n_pair(x1))