关于虚拟语气:it is strange that .should +动词原形.

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关于虚拟语气:it is strange that .should +动词原形.
请看题：
今天下午教室里竟然一个人都没有,真奇怪.
__________________________________ any students in the classroom this afetnoon.
seems strange that there should not have been
我知道加上should.但是句中的Have是哪里来的?没有理由用完成时啊?

shouldn't have + - ed 分词”意为“本来不应该……”.例如：
These cells should have been kept in somedry places.这些电池本来应该放（保存）在干燥的地方.（但实际上没有把它们放在干燥的地方.）
You shouldn't have dept those cells in the damp place.你本来不该把那些电池放在潮湿的地方.（但实际上已经把它们放到潮湿的地方了.）

关于虚拟语气:it is strange that .should +动词原形. 在主语从句中it is+adj+that后不是加虚拟语气should+动词原形 It is strange that he (should) have made a mistake.如果是虚拟语气sh 虚拟语气的问题it is strange that it is strange that为什么是虚拟语气?虚拟语气不是和事实相反吗? it's strange that后面加should吗?是虚拟语气还是竟然的意思? 虚拟语气中should + 动词原形的情况有哪些? 虚拟语气2It is strange that he ________ back so early. A. came B 在虚拟语气中,什么时候用would＋动词原形,什么时候用should＋动词原形这句话为什么用虚拟?It is strange that no one should like this book . 关于虚拟语气、语法书上虚拟语气形式有had+过去分词和should+动词原形,为什么不直接说是过去完成时和将来时?是不不 It is strange that she should have done it.句中should是情态动词吗?