A boy skateboards down the railing of some graffiti stairs
A boy is skateboarding with a friend.
Skateboarding does not have to be done with a friend.
exists e1 s1 x1 x2 x3 x4.(n_railing(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_skateboard(e1) & of(x2,x3) & n_stair(x3) & of(x3,x4) & n_graffitus(x4) & n_boy(x1))
exists e1 x1 x2.(with(e1,x2) & n_friend(x2) & Actor(e1,x1) & v_skateboard(e1) & n_boy(x1))