A brown dog leaps into a swimming pool.
The dog chases a ball into the pool.
Nothing in sentence 1 suggests a ball is present
exists e1 s1 x1 x2 x3.(into(e1,x2) & n_pool(x2) & of(x2,x3) & n_swimming(x3) & Actor(e1,x1) & v_leap(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_pool(x3) & n_dog(x1) & into(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2))