$\text{8.}$
$\text{→}$ I was bought a new blouse by my mother.
$\text{→}$ A new blouse was bought to me by my mother.
$\text{9.}$
$\text{→}$ I was given a ring by Tim last Sunday.
$\text{→}$ A ring was given to me by Tim last Sunday.
$\text{10.}$ Was this pagoda built 100 years ago?
* Form: Câu bị động thì QKD
S + was/ were + Ved/ P2 + (by).
was: I/ he/ she/ it
were: we/ you/ they