1/ The teacher doesn't allow me to take the seat by the window.
--> I am not allowed to take the seat by the window by by teacher
2/ They are building a new school in this town.
--> A new school is going to be built in this town
3/ We shall discuss the matter in the afternoon.
--> The matter shall be discussed by us in the afternoon
4/ Are you going to post this letter?
--> Is this letter going to be posted?
5/ He has to pay the bills before the fifth of the month.
--> The bills have to be paid befre the fifth og the month
6/ No one has opened that box for the past hundred years.
--> That box hasn't been opened for the past hundred years
7/ I can assure you that I will arrange everything in time.
--> I can assure you that everything will be arranged in time
8/ The enemy used to attack the bay.
--> The bay was used to attack by the enemy
9/ The fire has destroyed many houses.
--> Many houses have been destroyed by the fire.