it
it is believed that 的同义词？
is believed that 的同义词？
翻译成 据(人们)认为....
it 是形式主语.that后面引导的就是真实主语.
相似的句型还有
it is said that 据(人们)说
it is reported that 据(报纸)报道
等等
it is reported类似结构？
It is 加动词过去分词，表示“据。。。”
比如：it is said
it can be said that引导什么从句？
it 是形式主语，指代后置的主语从句 that。如果用正常语序 that ... is said (意思是 “that从句提到的这件事被说”，其实就是 “one says＋that 引导的宾语从句” 的被动语态)，未免主语部分太长，显得结构臃肿，所以就改用 it is said that ... 句式。
it is that 形式主语句型？
使用it做形式主语的常见结构:
Its a pity that… 很遗憾…
It is probable that… 很可能…
It is reported that… 据报道…
It occurred to me that… 我刚刚想到…
Its a common knowledge that…众所周知
It is no wonder that… 难怪…
It is said that… 据说…
It is well known that… 众所周知…
seems amazing that at my age I am still fit enough to cycle 20 kilometers in an afternoon.（英语必修六unit3 :Advice from grandad）
it is by是什么句型？
英语中it在句中可以充当形式主语，后面接that引导的从句为真正的主语。这种用法的目的是为了句子的平衡将真正的主语移到后面而避免句子结构的头重脚轻
it作形式主语的常见句型：
(1)It is adj. 主语从句(用于此句型的形容词有：easy,hard,difficultpossible, important,impossible,,surprising等)(2)It is n.十主语从句(用于此句型中的词汇有：a pity,a shame,no wonder ones duty,fun,good manners,bad manners等)
(3)It is 及物动词的过去分词 that从句(此句型中常见的及物动词的过去分词有：said，told, known, reported, thought,believed, considered等)
(4)It十不及物动词 主语从句(此句型中常见的不及物动词有：seem，appear，the happen等）
①It is evident that the local government is trying tohelp the graduates with employment.省很明显，当地政府正试图帮助大学生就业。
②Its a pity that the research indicates that 81% of teachers are dissatisfied with their salary.遗憾的是，研究表明81%的教师对他们的薪水不满意。
③Its said that he is doing well in school.据说他在学校里表现很好。
④It seems that he is not willing to go there.看来他不愿意去那里。
【多维练透】
补全句子
① It is obvious to the students (对学生来说很明显)that they should get well prepared for their future.
②It is a pity that (真遗憾) Jane and George cant make it to the party.
③It is important that (很重要) everyone should learn to get along well with others in a new environment.
④.But it was evident that ideas were changing in the 13thcentury when painters like Giotto di Bondone began to paint religious scenes in a more realistic style.(教材P.)但是很显然，到了13世纪时，(人们的)观念发生了变化，像乔托这样的画家开始以一种比较现实的风格来描绘宗教场景。