A woman and her son play in the sand on a sunny day in the beach.
A woman and her son play at the beach on his birthday
the fact that the woman and her son are playing does not imply that its his birthday.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_beach(x6) & n_sand(x4) & in(e1,x6) & on(e1,x5) & n_day(x5) & a_sunny(s1) & Theme(s1,x5) & in(e1,x4) & Actor(e1,x1) & v_play(e1) & subset_of(x3,x1) & n_son(x3) & of(x3,x2) & n_female(x2) & subset_of(x2,x1) & n_woman(x2))
exists e1 x1 x2 x3 x4 x5.(n_beach(x4) & on(e1,x5) & n_birthday(x5) & of(x5,x3) & n_male(x3) & at(e1,x4) & Actor(e1,x1) & v_play(e1) & subset_of(x3,x1) & n_son(x3) & of(x3,x2) & n_female(x2) & subset_of(x2,x1) & n_woman(x2))