An elderly man drives a unique firetruck.
An old man is driving a fire truck decorated for a parade.
Just because the man drives a unique firetruck does not mean it is for a parade.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_firetruck(x2) & a_unique(s2) & Theme(s2,x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))
exists e1 e2 s1 x1 x2 x3 x4 x5.(Theme(e2,x2) & Actor(e2,x1) & v_drive(e2) & for(e1,x5) & n_parade(x5) & Theme(e1,x4) & v_decorate(e1) & (x2 = x4) & n_truck(x2) & of(x2,x3) & n_fire(x3) & n_man(x1) & a_old(s1) & Theme(s1,x1))