A dog with no tail runs in the dirt.
The dog with the missing tail is having fun in the dirt.
Just because a dog with no tail runs in the dirt doesn't mean he is having fun. The dog may be running in the dirt to get away from someone.
exists x1 x3.(n_dirt(x3) & -exists e1 x2.(in(e1,x3) & Actor(e1,x1) & v_run(e1) & with(x1,x2) & n_tail(x2)) & n_dog(x1))
exists e1 s1 x1 x2 x3 x4.(n_dirt(x4) & n_tail(x2) & a_missing(s1) & Theme(s1,x2) & n_dog(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_fun(x3) & with(x1,x2))