1、It + be + 名詞 + that從句：It is a fact that 事實是。

It is an honour that 非常榮幸。

It is common knowledge that …是常識。

It is a pity that 遺憾…… 。

2、It + be + 動詞的過去分詞+ that從句。

It is said that 據說。

It is reported that 據報道。

It has been proved that 已經證明。

It is believed that … 人們認。

It is supposed that… 據猜測，

3、It + 不及物動詞（vi） + that 從句。

It seems that 似乎。

It happened that 碰巧。

It appears that 似乎。

4、It is natural that… 很自然…。

It is strange that… 奇怪的是… 。