A man is welding something on a cinder block.
A human welding
A man is a human, so a man is welding.
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_block(x3) & of(x3,x4) & n_cinder(x4) & Theme(e1,x2) & Actor(e1,x1) & v_weld(e1) & n_thing(x2) & n_man(x1))
exists s1 x1.(a_topic(x1) & n_welding(x1) & a_human(s1) & Theme(s1,x1))