2. 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。

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