Unit 4 Global warming
语法探究
1. It is/was well-known that…众所周知。例如：
It is well-known that Taiwan belongs to China.
众所周知，台湾属于中国。
It is well-known that the Great Wall is the longest wall in the world.
众所周知，长城是世界上最长的墙。
[思维拓展] 在这个句型中，that引导的是主语从句，此句型可以转换为as引导的定语从句，It is/was we ll-known that…相当于as we all know。例如;
As we all k now, the Great Wall is the longest wall in the world.
众所周知，长城是世界上最长的墙。
[问题探究] 你还知道类似的结构吗？
提示：常见的结构有：It is hoped that… 人们希望；It is said that…据说；It is reported that… 据报道；It is believed that…人们相信。例如：
It is said that he died from cancer last month.
据说，他上个月死于癌症。
