Cody and Luis haven't brought us back the books we lent them: passive forms

[dewedfrost]

Cody and Luis haven't brought us back the books we lent them. (1)
We haven't been brought back the books which were lent Cody and Luis by us. (2)

Here I am again asking for your help. The exercises says I have to turn 1) into passive. I have some doubts about the second part (which were lent Cody and Luis by us). I think it's correct from a grammar point of view, but it sounds unnatural to me.
I admit having already looked for some advice elsewhere on the net. I hope you are available to give me some suggestions. Thank you so much!

 

[GoesStation]

Sentence one is good, natural English. There's no reason to convert it into an awkward, unnatural, inferior passive-voice one.

Please include a link when you've asked for help elsewhere.

 

[jutfrank]

The books we lent Cody and Luis haven't been brought back.

 

[dewedfrost]

https://forum.wordreference.com/thr...nt-cody-and-luis-by-us.3654273/#post-18628968

 

[Tarheel]

Try:

We haven't gotten the books back that we lent Cody and Lewis.

There! (We're finished with this one.)