A boy going down a water slide.
A boy sliding.
Going down a water slide implies that the boy is sliding.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_go(e1) & n_slide(x3) & of(x3,x4) & n_water(x4) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_slide(e1) & (x1 = x2) & n_boy(x1))