这个句子是主语从句。从句在当一部分表达情绪，观点的形容词或名词才要用虚拟语气，如：necessary、important、impossible、natural、strange、surprising、funny、right、wrong、better、a pity ，the shame ，no wonder等。
在主语从句中, 为了防止句子头重脚轻，通常把形式主语it放在句首位置，真正主语搁置于句末用it 作形式主语的结构。
例句：
1、It is important that we all should attend the meeting.
翻译：重点是我们都应该出席这个会议.。
2、It is certain that he will win the match.
翻译：他肯定能赢下这场比赛。
3、It is funny that he dress like a monkey.
翻译：他穿着像只猴子，非常搞笑。
扩展资料：
(1) It is +名词+that从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it +不及物动词+that从句
it seems that… 似乎…
It happened that… 碰巧…
(3) it is+过去分词+that从句
It is reported that… 据报道…
It has been proved that… 已证实…
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