Перевести в пасивный залог: 1) we will discuss this question in our office 2)the pupils planted many trees near school 3)she will serve dinner at two o.clock 4)my little sister broke a cup

1) This question will be discussed by us in our office.
2) Many trees were planted  by the pupils  near the school.
3) Dinner will be served by her at two o'clock.
4)  A cup was broken by my little sister.