这里的it是形式主语吗?It is the assistant in charge of the scientific research.It is the assistant in charge of the scientific research who informed us of attending the academic activity.完整的句子。in charge of the scientific research

如何区分it 作形式主语 还是主语像 it is hard to say 这里的it是形式主语吗 还是做句子的主语 是翻译成这个很难说 还是说很困难可是 我认为 这句话的主语应该是人 应该是 I am hard to say it 因为 it is all right to show we're sad.这里面it做形式主语,真正主语是后面的不定式,但是we're sad做什么成分. It's just like him to be so rude!这里it是形式主语吗? 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,It is unusual for him to be late .这里的it是形式主语，to be late是真正的主语，麻烦分析一下句子成分， It is diffcult for us to do it It是形式主语 is diffcult是谓语 for 是介词 to do it是真正主语吗 As is known to all,the moon travels around the earth once every month.这里的as能换成it吗?it做形式主语加that, it is very kind of you to help me ,it是形式主语吗? 请问It is only for you 中it 是形式主语吗?only for you 关于形式主语!请问形式主语句形中,真正的主语一定要用不定式形式吗?如:it is still a question whether she will join us.这是形式主语句形吗? It is +adj+ to do sth中It是形式主语吗?真正的主语是动词不定式to do st it作形式主语的问题it 作形式主语的句型是 it + be动词,还是it + 谓语动词? 比如it must be obvious中的it就是形式主语那么it is good也是形式主语吗?如何区分it是不是形式主语? it is hard to understand why you love me.这里的 it是形式主语指代why.why you love me.做的是宾语还是主语啊如果是主语,此时的understand 是不及物动词吧?o意思是这里的宾语其实是主语 关于主语的形式take it easy is more important for you这里take用什么时态?要用ing么? 语法书上说：It is + adj./ n.+ for sb to do sth 做某事对某人来说……for sb是不定式的逻辑主语,to do sth是不定式做真正的主语,而it只是形式主语逻辑主语不就是形式主语吗?怎么for sb和it都是形式主 在有it的句子中,如何快速分辨,这里的it就是形式主语? 强调句的主语是IT吗比如说It is he who sleeps early.的主语是IT吗 我问的是句子分析,it is 是形式主语吗?想知道句子结构it is widely believed there are several positive aspects as follows