这句话是主语从句吗?it was not unusual that ten or more people ate at

It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分, he was so tired that he could not wake up .这是一个什么句子,是主语从句吗,中 it looks strange to some people 为什么这句话是主语从句? It was at the gate where I told him the news.是什么从句?是主语从句吗? it was arranged that 主语从句还是宾语从句? that was eight years ago是主语从句吗? It seemed that the world was at an end .这句话是虚拟语气吗? It was not that从句的用法 it is the first time that是主语从句吗 it seem+that从句是主语从句还是表语从句 下列seem之后的从句是主语从句还是表语从句?It seems (that)he was late for the tr 英语高手进：It seems that she will not come tomorrow.这句话里面it是形式主语么