There are trees with no leaves in the background.
The trees have leaves.
Trees with no leaves doesn't equal trees that have leaves.
exists p1 x1 x4.(n_background(x4) & exists x2.(-exists x3.((x1 = x2) & with(x2,x3) & in(x3,x4) & n_leaf(x3)) & n_tree(x2)))
exists e1 x1 x2.(n_tree(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_leaf(x2))