It is asking you to rewrite the sentence using the passive voice.
Let's practise
Rewrite the sentence below using the passive voice.
Paul had written a lovely thank you letter.
- Read the question carefully and read it again. What is it asking you to do?
Show me
- First, find the subject and the object in the sentence.
Show me
Subject = Paul. Object = letter.
- Swap the order of the subject and object so that the object is first.
Show me
A letter/had written/by Paul.
- Now, change the verb to make the sentence make sense.
Show me
had written = had been written
- Write out the sentence in the passive voice.
Show me
A lovely thank you letter had been written by Paul.
- Check your answer.