There are trees with no leaves in the background.
The trees have lost their leaves.
If the trees are with no leaves, then the trees have lost their 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_leaf(x2) & of(x2,x1) & n_thing(x1) & n_tree(x1) & Theme(e1,x2) & Actor(e1,x1) & v_lose(e1))