the dog barks at the toy.
The dogs are taking a nap.
Dogs is more than one dog.  If a dog barks at the toy then the dog is not taking a nap.
exists x1 x2 x3.(n_toy(x3) & n_bark(x1) & of(x1,x2) & n_dog(x2) & a_topic(x1) & at(x1,x3))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_nap(x2))