英語你我他文法篇106:主詞是that子句，可用it代替
講義
如果句子的主詞是that子句，可用it代替，再把that子句移到后面。
That the earth is round is true. = It is true that the earth is round.
地球是圓的是真的。
That you can not come to my wedding is a pity.
= It is a pity that you can not come to my wedding.
你不能來參加我的婚禮太遺憾了。
It's a bad habit that John goes to bed without brushing his teeth.
John每天不刷牙就上床睡覺真是個壞習慣。
如句中有how, when, where, why,或whether等疑問詞所引導的子句，也可以用it代替，再把子句移到后面。
How he escaped from jail is unknown.
= It is unknown how he escaped from jail. 沒人知道他是怎么越獄的。
Why she was killed is still a puzzle.
= It is still a puzzle why she was killed. 她的被害仍然是個謎。
