passive voice

little disagree with the above

1.A messenger will hand deliver the letter.
The letter will be hand delivered by a messenger

2.The official didn't sign the letter.
The letter was not signed by the official

3.Our garbage men didn't pick up our garbage.
Our garbage was not picked up by our garbage man

1) The letter will be hand delivered by a messenger.
2) The letter had not signed by the official.
3) Our garbage had not picked up by our garbage men.