A boy in a red shirt sledding down a sand dune.
The boy is holding on to a sled.
To go sledding you have to be holding onto a sled.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_sled(e1) & n_dune(x4) & of(x4,x5) & n_sand(x5) & (x2 = x3) & n_shirt(x2) & a_red(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2.(n_boy(x1) & r_on(e1) & to(e1,x2) & n_sled(x2) & Actor(e1,x1) & v_hold(e1))