The dog is running through the snow.
A dog is swimming in a lake.
A dog cannot be running and swimming simultaneously.
exists e1 x1 x2.(n_snow(x2) & n_dog(x1) & through(e1,x2) & Actor(e1,x1) & v_run(e1))
exists e1 x1 x2.(in(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_swim(e1) & n_dog(x1))