A man installs a sheet glass window.
Worker is on the work of installing the glass windows
A man installing a glass window doesn't mean he is at work.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_install(e1) & n_window(x2) & of(x2,x4) & n_glass(x4) & of(x2,x3) & n_sheet(x3) & n_man(x1))
exists p1 x1 x2 x4 x5.(n_window(x4) & of(x4,x5) & n_glass(x5) & n_work(x2) & ne_nam_worker(x1) & exists e1 x3.(on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_install(e1) & (x2 = x3)))