A biker doing a jump in a forest.
A biker is walking in the forest.
If you're a biker doing jumps you can't be walking at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & in(x3,x4) & n_forest(x4) & n_jump(x3) & (x1 = x2) & n_biker(x1))
exists e1 x1 x2.(n_forest(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_biker(x1))