A boat captain steering a large green wheel.
A guy is at the green helm of a boat.
The boat captain is a guy and a helm is a wheel of a boat.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_steer(e1) & n_wheel(x4) & a_green(s2) & Theme(s2,x4) & a_large(s1) & Theme(s1,x4) & (x1 = x3) & n_captain(x1) & of(x1,x2) & n_boat(x2))
exists p1 s1 x1 x2.(n_helm(x2) & a_green(s1) & Theme(s1,x2) & exists x3.(at(x1,x2) & of(x2,x3) & n_boat(x3)) & n_guy(x1))