Uniformed men walking down gravel pathway.
Men are building a tree house.
You can't be walking down a gravel pathway, while building a tree house.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_pathway(x3) & of(x3,x4) & n_gravel(x4) & (x1 = x2) & n_man(x1) & a_uniformed(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_house(x2) & of(x2,x3) & n_tree(x3) & n_man(x1))