A person is operating a crane.
A person reads a book.
A person cannot operate a crane and read a book simultaneously.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_operate(e1) & n_crane(x2) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2) & n_person(x1))