Объяснение:

1. A letter was written by Ann to me

2.A new car have been bought by Browns recently

3.what the tsunami caused by

4.the homework must be done by you every day

5.whom delicious cakes in your family made by

6.did a new café opened by them last weekend

7.a new book is being written by Jane

8.Had the house been cleaned by 5pm yesterday

9.a lot of photos will be sent to her by tom

10.what your smartphone is used for