Man with helmet performing a trick while rollerblading.
The man is rollerblading.
A man should be wearing a helmet while rollerblading.
exists e2 e1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & while(e1,e2) & Actor(e2,x3) & v_rollerblade(e2) & Theme(e1,x4) & Actor(e1,x3) & v_perform(e1) & n_trick(x4) & (x2 = x3) & n_helmet(x2) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_rollerblade(e1))