A vehicle climbs on rocks near a forest.
The rocks are big and are in the way.
A vehicle can climb on rocks even if the rocks are not big.  A vehicle can climb on rocks for reasons other than being in the way.
exists e1 x1 x2 x3.(on(e1,x2) & near(x2,x3) & n_forest(x3) & n_rock(x2) & Actor(e1,x1) & v_climb(e1) & n_vehicle(x1))
exists p1 s1 x1 x2.(n_way(x2) & n_rock(x1) & in(x1,x2) & Theme(s1,x1) & a_big(s1))