A man in red pants walking on rocks.
The rocks are big.
There are small rocks too, walking on rocks does not exactly mean a big one.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & on(e1,x4) & n_rock(x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_pants(x2) & a_red(s1) & Theme(s1,x2) & n_man(x1))
exists s1 x1.(n_rock(x1) & Theme(s1,x1) & a_big(s1))