A man is smoking at sunset.
a man smokes
A man who smokes is smoking at sunset.
exists e1 x1 x2.(at(e1,x2) & n_sunset(x2) & Actor(e1,x1) & v_smoke(e1) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_smoke(e1) & n_man(x1))