A 以名词从句作主语的句子常常由it开头:
It is disappointing that Tom cant come.
汤姆不能来,真扫兴。(that Tom cant come是主语。)
B 常见的结构是it+be/seem+形容词+名词从句:
Its splendid that you passed your exam.
你通过考试了,真棒。
Its strange that there are no lights on.
真奇怪,没有一盏灯是开着的。
有些形容词需要或可以与thatshould连用:
It is essential that everybody knows/should know what to do.
重要的是,每个人都应知道该做什么。
C 另一种可代用的结构是it+be/seem+a+名词+名词从句。
下列名词均可用于这种结构:mercy,miracle,nuisance,pity,shame,relief,wonder。也可以使用a good thing。
Its a great pity(that)they didnt get married.
他们没能结婚,真是令人惋惜。
Its a wonder(that)you werent killed.
你没死掉真是个奇迹。
Its a good thing(that)you were insured.
你保了险,这可是件好事。
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