Question

help me please change the voice​

Answer 1

9) The seminar must be attended by them.
10) A copy of the certificate was provided to me by them.
11) Let the bill be paid today.
12) How is the parcel being sent by you?
13) The earth is said to be round by them.

HOPE THIS HELPS!

Answer 2

Answer:

                                                                             

A copy of certificate is provided by them to me.

The bill must be payed today.

How is the parcel being sent by you?

The earth is round is told by them.