A boy is leaning against a brick wall near some trees.
A boy is leaning against a brick wall near some trees with no leaves.
You can not infer there are no leaves.
exists e1 x1 x2 x3 x4.(against(e1,x2) & near(x2,x4) & n_tree(x4) & n_wall(x2) & of(x2,x3) & n_brick(x3) & Actor(e1,x1) & v_lean(e1) & n_boy(x1))
exists e1 x1 x2 x3 x4.(-exists x5.(with(e1,x5) & n_leaf(x5)) & against(e1,x2) & near(x2,x4) & n_tree(x4) & n_wall(x2) & of(x2,x3) & n_brick(x3) & Actor(e1,x1) & v_lean(e1) & n_boy(x1))