Two children are sliding down a water slide.
Some children are playing.
Sliding down a water slide implies playing, and two implies some
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & n_slide(x2) & of(x2,x3) & n_water(x3) & n_child(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_child(x1))