He's hard at work creating pieces.
The man is eating dinner.
You are not eating dinner while being hard at work creating pieces.
exists e1 s1 x1 x2.(for(s1,e1) & Theme(e1,x2) & Actor(e1,x1) & v_create(e1) & n_piece(x2) & at(s1,x1) & n_work(x1) & Theme(s1,x1) & a_hard(s1) & n_male(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_dinner(x2) & a_eating(s1) & Theme(s1,x2)))