A man is walking in the rain.
dog jumps on couch
There can be either a man or a dog.
exists e1 x1 x2.(n_rain(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_couch(x3) & n_jump(x1) & of(x1,x2) & n_dog(x2))