that引导主语从句

一般置于句末，偶尔也置于句首

that引导的主语从句置于句首

1. That the seas are being overfished has been known for years.
2. That the plates are moving is now beyond dispute.

有时候即使很长很复杂的主语从句，也可以直接置于句首来做主语（并不常见）

1. That such a conjunction of circumstances might accur again soon, especially considering shrinking US defense budgets and diminishing overseas base access, is problematical at best.

that引导的主语从句置于句末

It+be动词+过去分词+that从句

It+be动词+形容词+that从句

It+be动词+名词短语+that从句

It+不及物动词+that从句

其他结构

it is/was...that引导的主语从句与作为强调句使用的区别

把强调句的 It is 和 that 丢掉，整个句子还是完整的，而主语从句去掉后句子会出错

1. It is a pity that our team should lose the game.
   去掉it is...that...后， our team should lose the agme/ a pity 这句会出错，所以是主语从句
2. It was on a rainy day that Lu Yiping borrowed money from her father.
   去掉it is...that...后，Lu Yiping borrowed money from her father on a rainy day. 这句正确，所以是强调句

原文地址：https://www.cnblogs.com/houzm/p/12255254.html