A man and a boy in a yard playing with pool toys.
A man and his son are playing outside in the afternoon.
Not every boy playing with a man is the son of the man he is playing with. The afternoon is not the only time one can play in a yard.
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x2,s1) & in(x2,x3) & with(x3,x5) & n_toy(x5) & of(x5,x6) & n_pool(x6) & n_playing(x3) & of(x3,x4) & n_yard(x4) & n_boy(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(n_afternoon(x4) & in(e1,x4) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1) & subset_of(x3,x1) & n_son(x3) & of(x3,x2) & n_male(x2) & subset_of(x2,x1) & n_man(x2))