a boy in a purple shirt is doing a skateboard stunt on a wooden ramp beside a white building.
A boy is roller skating
If he is roller skating then he is not on a skateboard.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6.(beside(e1,x6) & n_building(x6) & a_white(s3) & Theme(s3,x6) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & on(x3,x5) & n_ramp(x5) & a_wooden(s2) & Theme(s2,x5) & n_stunt(x3) & of(x3,x4) & n_skateboard(x4) & in(x1,x2) & n_shirt(x2) & a_purple(s1) & Theme(s1,x2) & n_boy(x1))
exists p1 x1.(exists e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_skate(e1) & (x2 = x3) & n_roller(x2)) & n_boy(x1))