【分析】

It （形式主语：代替后面的主语从句）is generally accepted （谓语） that a boy must learn to stand up and fight like a man.（真正主语：主语从句）

此结构由下列句子的主动语态变来。要做到举一反三，不要拘泥于某一个句子，要学会掌握句子类型。

1. People （主语）generally accept （谓语）that a boy must learn to stand up and fight like a man.（宾语）

2. 变成被动语态：

That a boy must learn to stand up and fight like a man is generally accepted by people.

3. 主语太长，我们用形式主语代替：

It is generally accepted by people that a boy must learn to stand up and fight like a man.

4. 被动语态的施事者by people，经常省略不说，所以：

It is generally accepted that a boy must learn to stand up and fight like a man.

▲ 我认为，学英语最关键的不在某个句子本身，而是要掌握哪些动词可以有accept 这个用法，都可以接宾语从句，都能变成It is accepted that...这个格式。这才是掌握了英语的真谛。一般来说，凡是能接that 宾语从句的动词，都可以有此句型。

 It is said (reported, believed, agreed, announced, hoped, expected, thought...) that句式

该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为“据说（据报道，人们相信…）”。 

It is said that he has gone to Los Angles. 

It is reported that another earth satellite has been sent into orbit.

下面，再提供一些：

acknowledge  承认

It is acknowledged that

admit 承认；赞同

It is admitted that

agree 同意

It is agreed that

be argue 论证；争辩

It is argued that

announce  宣布；公布

It is announced that

claim 声称；断言；主张

It is claimed that

confirm 证实；证明

It ss confirmed that

deny  否认；否定

It can not be denied that

explain 解释；说明

It is explained that

hold 持有，怀有(观点或信念)

It is held that

point out 指出；指明

It is pointed out that