A man is standing by trees.
A man is next to trees in a park.
The man could be standing anywhere that happens to have trees, it does not have to be in a park.
exists e1 x1 x2.(by(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists s1 x1 x2 x3.(to(s1,x2) & in(x2,x3) & n_park(x3) & n_tree(x2) & Theme(s1,x1) & a_next(s1) & n_man(x1))