A small boy climbing a backyard play set.
A boy climbing the play set his parents bought him for his birthday.
A play set may be gifted by anyone, and it cannot be inferred that his  parents bought him for his birthday.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x1) & v_set(e2) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_play(x3) & of(x3,x4) & n_backyard(x4) & (x1 = x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
exists e1 e3 e2 x1 x2 x3 x4 x5 x6.(n_birthday(x6) & of(x6,x3) & n_male(x3) & n_male(x3) & n_male(x3) & n_parent(x4) & of(x4,x3) & n_play(x3) & Theme(e3,x4) & Actor(e3,x1) & v_set(e3) & for(e2,x6) & Theme(e2,x3) & Actor(e2,x5) & v_buy(e2) & (x4 = x5) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & (x1 = x2) & n_boy(x1))