A man is sitting down making some pottery.
man using pottery wheel
Just because the man is making some pottery, it doesn't mean he is using a pottery wheel.
exists e1 e2 s1 x1 x2.(for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_make(e2) & n_pottery(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & n_wheel(x3) & of(x3,x4) & n_pottery(x4) & (x1 = x2) & n_man(x1))