这里是否省略了主语It seems that man was making a real effort to understand the seasons 20,000 years earlier than ( )has been supposed.than 与has been supposed 之间是否省略了什么?

这里是否省略了主语It seems that man was making a real effort to understand the seasons 20,000 years earlier than ( )has been supposed.than 与has been supposed 之间是否省略了什么? as if在这里可以省略吗It seems as if it is going to rain.看来快下雨了. it+seems.that从句 是什么从句it+seems...+that从句 是什么从句?1 主语从句?宾语从句?seem 在这里是系动词吗?如果是,那是不是 表语从句了?请大家讲讲,共同交流.2 that 可以省略么? it seems that .中的that可以省略吗?看四级书上有省略的例子：It seems there are two purposes of sleep.但是语法书上和百科里都说it seems +that 从句,是主语从句,那主语从句中的that不能省略吧?那这个省略 1.The car damaged in the accident can't be used unless ___ completely .repaired 我知道这里表示被动,所以用过去分词.而且我觉得unless后面省略了主语和谓语,这里是否 = it was repaired 还是 it is repaired .还是我的 Now we are not allowed to touch it还原Now we are not allowed to touch it.这里省略了主语my father,谁能把主语加上,用被动语态?或者,不能加? It is suprising that 主语 should do 中should 是否可省略 在那个《火星英语》的语法书上看到那个.it seems to me ……是那个主语从句.那么 it seems that 与 it seems to me 是否有区别呢? 主语从句和表语从句it seems that.这种句型到底是主语从句还是表语从句,一些参考书说是主语,一些说表语,我搞晕了~ it seems that中that可以省略吗 it seems the two are more deeply linked than we .这句里是不是seem后面省略了 that It is no wonder you were late.这句中为什么后面的主语从句省略了that?主语从句不是不可以省略that吗? he found it not easy to sleep为什么这里it后的be 动词省略了 the job you're offering will give me everything i want.这里面的 you're offering 是做什么成分?同时,offering在这个句子里是什么词性?是名词还是动词还是动名词啊,困扰我好久了 修饰the job主语不是不能省略th 这里it was为什么能省略 英语强调句中当被强调的部分是主语时.it is her experiment that/who is important tp her.强调的部分是experiment,是主语,但又不是人,这里到底是改用who 还是该用that?还是两个都错了?那么it is her experiment th it‘s + 形容词 + doing 形容词和doing间是否有介词省略?It's dangerous swimming in the sea.是否有省略,或是只是简单的动名词做主语swimming in the sea is dangerous It seems that 和 It seems as if中的是形式主语吧?真正的主语呢?逻辑主语呢?（请详细一点,