Question

分析一下这句话的句子结构，所用的语法

It's definitely been shown in all different ways that when you put a whole population under a stressor that sudden death will increase.

Answer 1

It's definitely been shown /in all different ways/ that when you put a whole population under a stressor that sudden death will increase.

It's definitely been shown /in all different ways：第一个结构做以it引导的形式主语，其中这里包含了被动语态结构：It's（has) definitely been shown---做谓语；/in all different ways---方式状语；

that when you put a whole population under a stressor /that sudden death will increase.这句子做的是真正主语，其中包含以when 引导的时间状语； /that sudden death will increase. 简单句的基本句型结构，只做主谓成份。

Answer 2

it形式主语
has been shown被动结构，位于成分
in all different ways 方式状语
that从句，主语从句，真正的主语。
其中that从句里面，when从句是时间状语从句，后面的that从句才是真正的从句结构，包含了主谓成分。

追问

最后真正的主语里正常语序是不是就是sudden death will increase when you put a whole population under a stressor ，那为什么sudden death will increase前要加that

追答

that sudden death will increase这是真正的主语从句，最前面的that是定语从句，修饰ways。

Answer 3

这是复合句， 由被动语态和that从句所构成的，是双重从句，这里的that可省略

Answer 4

It 形式主语

has definitely been shown 现在分词的被动语态，做谓语
in all different ways 方式状语
that when you put a whole population under a stressor that sudden death will increase.

that引导的时间状语从句做真正主语