A maintenance worker is climbing into his green truck.
The worker drove the bulldozer.
There is either a green truck or a bulldozer.
exists e1 s1 x1 x2 x3.(into(e1,x3) & n_truck(x3) & a_green(s1) & Theme(s1,x3) & of(x3,x1) & n_male(x1) & Actor(e1,x1) & v_climb(e1) & n_worker(x1) & of(x1,x2) & n_maintenance(x2))
exists e1 x1 x2.(n_bulldozer(x2) & n_worker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1))