a dog runs through the long grass.
a cat runs
Either the cat or the dog are running.
exists e1 s1 x1 x2.(n_grass(x2) & a_long(s1) & Theme(s1,x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1.(Actor(e1,x1) & v_run(e1) & n_cat(x1))