They (to help) tomorrow. The work (to do) yesterday. как в пассивный перевести?

1) They will be helped tomorrow. 2) The work was done yesterday. 3) The problem was discussed yesterday. 4) The books were read by me. 5) The problem will be discussed by us. 6) The cake was made by my mother. 7) The door was opened by him. 8) The concert will be organized by University Council.