Three men and a small boy work on a green model train outside.
The small boy is one of the men's children.
Sentence 2 can refer to different men and boy.
exists s1 s2 s3 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x2,s1) & on(x2,x4) & n_outside(x4) & of(x4,x6) & n_train(x6) & of(x4,x5) & n_model(x5) & a_green(s3) & Theme(s3,x4) & n_work(x2) & of(x2,x3) & n_boy(x3) & a_small(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_man(x1) & card_eq_3(x1))
exists p1 s1 x1 x3 x4.(n_child(x4) & of(x4,x3) & n_man(x3) & n_boy(x1) & a_small(s1) & Theme(s1,x1) & exists x2.((x1 = x2) & of(x2,x4) & n_thing(x2) & card_eq_1(x2)))