из активного в пассивный залог
1) By the time I arrived, someone had already opened all your letters
2) We usually talk briefly about the problems of the family at dinner time
3) Nobody has used this room for eages
4) We will give you the keys tomorrow
5) Some is interviewing Dr. Jhonson at the moment

1- By the time i arrived, all your letters had been already opened2-3-That room hadn't been used for ages4-The keys will be given to you the following day5-Dr.Jhonson is being interviewing at that moment