it是形式主语真正的主语是后面的he was very happy主语he was very happy谓语seemed友情提示：it作形式主语常见句式 ：It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如：It seemed that he didn’t tell the truth.It happened that I was out when he called...
这个句子原本是这样的：It(形式主语） seemed （系动词）to be true （表语）that he was very happy（主语从句）可后来，随着语言的演变，就成了现在这样子了It （主语， 无意义）seemed（系动词） that he was very happy（表语从句）等于： He seemed to be ...
it 在句子中的成分是形式主语。句子分析：It seemed that he was very happy.中，it是形式主语，也就是说不是真正的主语。seemed是系动词加上后面的that，it seemed that 就引导出一个表语从句。真正的主语是he was very happy 整个句子------------------------...
