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
- That the seas are being overfished has been known for years.
- 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）
- 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
| 句型 | 含义 | 例句 |
|---|---|---|
| It seems that... | 似乎... | |
| It follows that... | 因此.../由此可见 | |
| It happens that... | 碰巧... | |
| It turn out that... | 结果证明是... | |
| It comes about that... | 结果是... |
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
- 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 - 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