Men in military uniform get a ride on the back of a tractor.
Men are riding on the back of a tractor
Men who get a ride on something are riding it.
exists e1 s1 x1 x2 x3 x4 x5.(n_back(x4) & Theme(e1,x3) & Actor(e1,x1) & v_get(e1) & on(x3,x4) & of(x4,x5) & n_tractor(x5) & n_ride(x3) & in(x1,x2) & n_uniform(x2) & a_military(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(n_back(x2) & on(e1,x2) & of(x2,x3) & n_tractor(x3) & Actor(e1,x1) & v_ride(e1) & n_man(x1))