A boy and a dog running on grass
The boy is having a good Christmas.
There can be either a boy and a dog or only a boy.
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & on(e1,x4) & n_grass(x4) & Actor(e1,x3) & v_run(e1) & (x2 = x3) & n_dog(x2) & subset_of(x1,s1) & n_boy(x1))
exists e1 s1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & ne_tim_christmas(x2) & a_good(s1) & Theme(s1,x2))