a man doing a rollskating trick on a ramp
The man is skateboarding.
roll skating cannot be skateboarding.
exists e2 e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_do(e2) & on(x3,x4) & n_ramp(x4) & n_trick(x3) & Actor(e1,x3) & v_rollskate(e1) & (x1 = x2) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_skateboard(e1))