Doctors are performing surgery.
A chiropractor rubbed his patients back with a cloth.
performing and rubbed are two different actions
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_surgery(x2) & n_doctor(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_rub(e1) & with(x3,x4) & n_cloth(x4) & back(x2,x3) & n_thing(x3) & n_patient(x2) & of(x2,x1) & n_male(x1) & n_chiropractor(x1))