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試著說出It的用法。

We published it that we had won the football game．

It做形式________；指代________從句。

試著說出It的用法。

It's surprising that he should ask me such a difficult question．

It做________主語(yǔ)；指代________從句。

試著說出It的用法。

It's no use crying over spilt milk．It做________主語(yǔ)。

試著說出It的用法。

You may find it exciting working here．It做形式________；指代________短語(yǔ)。