A dog leaps over a barrier.
A dog is leaping.
Leaps over means the dog is in the act of leaping.
exists e1 x1 x2.(over(e1,x2) & n_barrier(x2) & Actor(e1,x1) & v_leap(e1) & n_dog(x1))
exists e1 x1.(Actor(e1,x1) & v_leap(e1) & n_dog(x1))