a dog trots through the grass.
A dog is sitting in his bed.
A dogs trots cannot be sitting at the same time.
exists e1 x1 x2.(n_grass(x2) & through(e1,x2) & Actor(e1,x1) & v_trot(e1) & n_dog(x1))
exists e1 x1 x2.(in(e1,x2) & n_bed(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_sit(e1) & n_dog(x1))