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It代替从句作形式主语的常见句型
一、it 代替连词 that 引导的从句作形式主语。

1、it + be + 过去分词 + that 从句:

It’s said that Tom has come back from abroad .

It was reported that dozens of children died in the accident .

可用于该句型的过去分词还有：known , thought , told , believed , hoped , announced ,expected , decided , suggested等，该句型常可以转换成含有宾语从句的复合句或者含有不定式作主补的简单句。如：

It’s said that Tom has come back from abroad .

→People say that Tom has come back from abroad . →He is said to have come back from abroad .

2、It + be + 名词词组 + that 从句:

It’s a pity that he can’t swim for his age .

It’s a wonder that you could finish such a hard task in such a short time .

可用于该句型的名词词组还有：an honour , a good thing , a fact , a surprise , good news等。

3、It + be /seem + 形容词 + that 从句:

It is likely that they will beat us tonight .今晚很可能他们会赢我们。

It doesn’t seem that she will give us a hand .她帮我们的可能性似乎不太大。

可用于此句型的开容词还有；wonderful , true , good , right , wrong , (un)important ,useless , surprising , clear , possible , unusual , lucky , certain 等。

4、It + seem / appear / happen + that 从句:

It seems that he enjoys pop songs very much .看来他非常喜欢流行歌曲。

It appears that Tom might change his mind .看来汤姆会改变主意。

It happened that I went out that day .碰巧我那天外出了。

二、it 代替连接代词或连接副词引导的从句作形式主语。

1、 It is known (not decided , not made clear , found out , discussed , being discussed , being considered , a question , uncertain等) + 连接代词或连接副词引导的从句。

It is still a question when we shall have our sports meet . 我们将什么时候举行运动会还是一个问题。

It is uncertain whether he can attend this conference or not . 他能否来开会还不能确定。

2、It doesn’t matter(doesn’t matter too much , doesn’t make too much difference等) + 连接代词或连接副词引导的从句。如：

It doesn’t matter whether we go together or separately . 我们一起去还是分开去都可以。

It doesn’t matter too much to me what you do or where you go . 你做什么或去什么地方，对我都无关紧要