A man is operating a piece of machinery.
A man operates a piece of machinery on his last day of employment.
Operating machinery does not imply it is on the last day of employment.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_operate(e1) & of(x2,x3) & n_machinery(x3) & n_piece(x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_operate(e1) & on(x2,x4) & of(x4,x5) & n_employment(x5) & n_day(x4) & a_last(s1) & Theme(s1,x4) & of(x4,x1) & n_male(x1) & of(x2,x3) & n_machinery(x3) & n_piece(x2) & n_man(x1))