15  It was said  that his football team had played well last season/ His football team was said to have played well last season
16 It is said that he is the richest man in our town.
17  It is thought that he has died a natural death. / He is thought to have died a natural death
18  It is believed that 13 is an unlucky number. / 13 is believed to be an unlucky number.
19 It is said that John is the brightest student in class./  John is said to be the brightest student in class.