A young man working at a computer.
the man is white
Not all men are white.
exists e1 s1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_computer(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1.(n_man(x1) & Theme(s1,x1) & a_white(s1))