Impersonal Passive (It is said/reported/thought that...)
It is said that the company is bankrupt. It is believed that the suspect has fled the country. It is reported that three people were injured. It is thought that the painting is a forgery. It is expected that the president will resign. It is understood that a deal has been reached. It is alleged that he accepted bribes. It is estimated that over 10,000 people attended.
Personal Passive (He/She/They is/are said to...)
He is said to be a genius. She is believed to have written the novel. They are thought to be hiding in the mountains. The treasure is believed to be buried here. The missing hikers are presumed to have died. The suspect is known to have a criminal record. The minister is expected to announce new policies. She is considered to be the best in her field.
Past reporting verbs (was/were + passive)
It was announced that the festival would be cancelled. It was believed that the earth was flat. He was thought to be innocent until the evidence emerged. It was reported that the ceasefire had been broken.
Perfect infinitive for earlier actions
He is believed to have left the country. She is thought to have won the lottery. The building is said to have been built in 1850. They are alleged to have stolen the money.
Negative forms
It is not believed that he will return. He is not expected to win the election. No one is thought to have survived the crash.