1,we had a man repaint our house

=>We had our house repainted by a man.

2, nobody could answer her quéstion

=>Her question couldn't be aswered by anyone.

3, i want my dad to take me to school by car

=>I want to be taken to school by cat by my dad.

4, people say that he is looking for a big film

=>it is said that he is looking for a big film

he is said to look for a big film.

5, they belived the earth was flat

=>it is believed that the earth was flat.

the earth is believed to be flat.