Question

change into passivevoice:they had locked all the doors.2.had he invited all of you to dinner?3.I shall see you tomorrow.

Answer 1

hey buddy here are your answers
1)all the doors were locked by them
2)were all of you invited to dinner by him
3)you shall be seen by me tomorrow

hope my answer helps you dude

Answer 2

1.The door had been looked by all,2.
3.Tomorrow shall be see by me