An older man shows how to use a machine.
The man is teaching how to use a machine.
The man who is teaching how to use the machine is the older man.
exists e1 s1 x1 x2.(Topic(e1,x2) & Actor(e1,x1) & v_show(e1) & n_manner(x2) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_use(e2) & n_machine(x4)) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_man(x1) & Topic(e1,x2) & Actor(e1,x1) & v_teach(e1) & n_manner(x2) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_use(e2) & n_machine(x4)))