1. Letters are typed in the office by Mary.
2. You will be helped by his father tomorrow.
3. Human life has been completely changed by science and technology.
4. This bottle was broken by peter.
5. English is being learnt by them.
6. My mind can not be changed.
7. I hadn't been told about it.
8. Her telephone number isn't known.
9. The children home will be brought by my students.
`Jeikei`
