Workers are in the kitchen while a man sits at a table.
The chefs in the kitchen prepare a meal for the man at the table.
Just because they are workers do not mean that they are chefs.
exists p1 p2 x1 x2.(n_kitchen(x2) & exists e1 x3 x4.(at(e1,x4) & n_table(x4) & Actor(e1,x3) & v_sit(e1) & n_man(x3)) & while(p1,p2) & in(x1,x2) & n_worker(x1))
exists e1 x1 x2 x3 x4 x5.(n_table(x5) & n_man(x4) & n_kitchen(x2) & n_chef(x1) & Theme(e1,x3) & Actor(e1,x1) & v_prepare(e1) & for(x3,x4) & at(x4,x5) & n_meal(x3) & in(x1,x2))