A man using a bulldozer or Bobcat to dig earth.
A sales clerk ringing up a sale.
The subject is either a man who is bulldozing or a sales clerk that is ringing up a sale.
exists e1 p1 x1 x2 x3.(a_topic(x1) & Theme(e1,p1) & Recipient(e1,x3) & Actor(e1,x2) & v_use(e1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x2) & v_dig(e2) & n_earth(x4)) & (n_bulldozer(x3) | n_bobcat(x3)) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_ring(e1) & n_sale(x4) & (x1 = x3) & n_clerk(x1) & of(x1,x2) & n_sale(x2))