A man chopping something with a knife on a table.
a person using a knife.
A person using a knife is usually chopping something.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & with(e1,x4) & on(x4,x5) & n_table(x5) & n_knife(x4) & Theme(e1,x3) & Actor(e1,x2) & v_chop(e1) & n_thing(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & n_knife(x3) & (x1 = x2) & n_person(x1))