People are pouring cement for the work.
Nobody is pouring
People are "somebody," not "nobody."
exists e1 x1 x2 x3.(n_work(x3) & for(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_pour(e1) & n_cement(x2) & n_people(x1))
-exists e1 x1.(Actor(e1,x1) & v_pour(e1) & n_person(x1))