It is a pity that such a thing ( should ) happen in your class.
这种事竟然发生在你们班上,真是遗憾!
It is a pity that he is ill. 他生病了,真遗憾!
6. It is time ( about time , high time ) that ...
该句型中that 后的从句应该用虚拟语气,值得注意的是:① 常用过去时态表示虚拟.② 有时也用should + 动词原形,should 不能省。常译为是(正是)的时侯。
It is time that children should go to bed.
= It is time that children went to bed.
7. It is the first ( second ) time that
该句型要和上一个句型区别开来。该句型中的 that 从句不用虚拟语气,而用完成时态。至于用什么完成时态,由主句的谓语动词的时态决定。如果是一般现在时,后面从句用现在完成时态;如果是一般过去时,后面从句则用过去完成时态。该结构中 that 可以省去;it 有时用 this 替换,常译为是第一(二)次。
It is the first time I have been here.
= This is the first time I have been here.
8. It is since ...
该句型主要用作处理瞬间动词的完成时,又要和表示一段时间的时间状语连用的问题。主句中是时间作表语,其时态是现在时或完成时,since 引导的从句通常是一般过去时态,而且是瞬间动词。如果主句是一般过去时,从句则用过去完成时。
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