A man smiles while he washes windows.
A man is working.
Washing a window is a form of working.
exists e1 p1 x1.(exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_wash(e2) & n_window(x2)) & n_male(x1) & while(e1,p1) & Actor(e1,x1) & v_smile(e1) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_man(x1))