Question

they had prepared the dinner before we arrived Change into passive voice​

Answer 1

The dinner had been prepared before we arrived by them.

Additional information :

• When the verb speaks of its subject as acting , it's said to be active voice.

• Formation - subject + verb + object

• Example - She had made this earlier.

• When the verb speaks of its subject and being acted upon or having something done to it , is called to be in passive voice.

• Formation - object + past participle + subject

• Example - This had been made earlier by her.

Answer 2

$\colorbox{pink}{The dinner had been prepared before we arrived by them.}$