1. A new dress for Ada has been made by mother.
2. All exercises have been done by them in written form.
3. Everything had been done by them before we came.
4. I thought, the letter had been sent by them.
5. Some new metro lines are being constructed now by them.
6. Wait a little. The last students are being examining there by them.
7. This question is being discussed now by them.
8. Her face is hidden by the branches of the tree.
9. I now her family. I has been taken there more than once by her brother Charles.
10. Some milk was brought from the kitchen by Ann.
11. You had been seen in Oxford street by them.