A skateboarder performing a kickflip over short stairs.
The skateboarder is wearing a helmet and knee pads.
Not all skateboarders skateboard wearing a helmet and knee pads.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_stair(x4) & a_short(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_kickflip(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 x1 x2 x3 x4 x5.(n_skateboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & subset_of(x4,x2) & n_pad(x4) & of(x4,x5) & n_knee(x5) & subset_of(x3,x2) & n_helmet(x3))