my wife think that it could be an animal 是从句?什么从句?

wife,it,my,that,thinks,an,could,animal,be(连词成句） it could be that he was happy 的意思 it could be that +从句 是句型吗 i think it +n\adj+that从句中it做什么成分?是形式宾语吗? That is not an easy question _____ you think to be.这是一个定语从句还 主语从句It + be + 形容词 + that从句:be用什么形式? it seem+that从句是主语从句还是表语从句 形式主语后的从句是什么从句?例：It be +adj.+that从句 It be 如果是It＋be动词＋adj＋that从句,be动词为过去式或将来时或完成时,那从句用什么时态? It be reported that 中的be用 is 还是was?还有that从句中用什么时态? 关于主语从句造句it+be+名词+that从句it+be+形容词+that从句it+be+动词过去分词+that从句it it is true that是引导什么从句咯, it is time that 从句 那这个从句到底属于是什么从句啊?如果是定语从句,那time在从句中做什么成分?