A man operating a large tractor.
The tractor is green.
Not all tractors are green.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_operate(e1) & n_tractor(x3) & a_large(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists s1 x1.(n_tractor(x1) & Theme(s1,x1) & a_green(s1))