The boy is jumping into the swimming pool.
The boy is swimming in his uncle's pool.
Just because the boy is jumping into a swimming pool doesn't indicate that it is his uncle's pool.
exists e1 x1 x2 x3.(n_pool(x2) & of(x2,x3) & n_swimming(x3) & n_boy(x1) & into(e1,x2) & Actor(e1,x1) & v_jump(e1))
exists e1 x1 x2 x3.(n_pool(x3) & of(x3,x2) & n_uncle(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & in(e1,x3) & Actor(e1,x1) & v_swim(e1))