1. It is generally agreed that…

The novel immediately became very popular and it is generally agreed that it is one of the best science fiction stories ever written.

一致认为…

It is said/reported/known/believed/hoped… that … to do/ to have done

据说/据报道/众所周知/人们相信/人们希望…

This is the best work ever done.

He is the most thoughtful man ever seen.