Final answer:
The passive form of 'They didn't offer us anything to drink.' is 'Nothing to drink was offered to us.', focusing on the action rather than the actor.
Step-by-step explanation:
The passive voice form of the sentence 'They didn't offer us anything to drink.' would be 'Nothing to drink was offered to us.' In passive voice, the focus is on the action 'offered' rather than who is doing the action. It's important to identify the object being acted upon, 'anything to drink,' and make it the subject of the passive sentence, resulting in 'Nothing to drink.' We then follow with the passive verb 'was offered' and the indirect object 'to us' to complete the transformation from active to passive voice.