A guy mowing a lawn on his tractor
A guy is surrounded by green grass.
Mowing a lawn implies being surrounded by grass.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_mow(e1) & on(x3,x4) & n_tractor(x4) & of(x4,x1) & n_male(x1) & n_lawn(x3) & (x1 = x2) & n_guy(x1))
exists e1 s1 x1 x2.(Actor(e1,x2) & n_grass(x2) & a_green(s1) & Theme(s1,x2) & Theme(e1,x1) & v_surround(e1) & n_guy(x1))