`9,` It is thought that your father was a spy in the World War II.

hoặc: Your father is thought to have been a spy in the World War II.

`-` It is `+` thought that `+` S `+` V..

`=` S `+` tobe `+` thought `+` to `+` have V-ed/V3..

`10,` It is believed that he has special knowledge which may be useful for the police.

hoặc: He is believed to have special knowledge which may be useful for the police.

`-` It is `+` believed that `+` S `+` V `+` O..

`=` S `+` tobe `+` believed `+` to V0..

`9.` Your father is thought to have been a spy in the World War II.

`10.` He is believed to have special knowledge which may be useful to the police.

`@××××××××××@`

`star` `B`ị động đặc biệt :

`-` They/people + think/say/believe that + S + V

`=` It + be + thought/said/believed that + S + V

`=` S + be + thought/said/believed + to V (Nếu V1 và V2 cùng thì)

`=` S + be + thought/said/believed + to have PII (Nếu V1 và V2 khác thì)