The dog is on the fence
A dog tries to dig under a fence.
Trying to dig under the fence is different than being on the fence.
exists p1 x1 x2.(n_fence(x2) & n_dog(x1) & on(x1,x2))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 x2.(under(e2,x2) & n_fence(x2) & Actor(e2,x1) & v_dig(e2)) & n_dog(x1))