`1. `It is believed that 13 is an unlucky number.
`-` Form: It + be + VpII + that + S + V
`2.` It is thought that he has died for many years.
`-` Form: It + be + VpII + that + S + V
`3.` It is said that John is the biggest student in class.
`-` Form: It + be + VpII + that + S + V
`4.` It was thought that she won the first prize.
`-` Form: It + be + VpII + that + S + V