it turns out that 与it seems that 是系表结构嘛老师？还是that引导的是主语从句？请老师确认！

1. It turns out that...中的that引导的不是主语从句而是表语从句。turn out表“证明是；结果是；原来是”时为系动词，可接形容词、副词、名词、不定式（常用to be）、从句（用先行词it作主语）作表语，间或接介词短语等其它结构。在It turns out that...句式中，引导词“it”没实质意义，在句中用作虚拟主语，指某种状况或现象，that引导表语从句说明这样的情况或现象。又比如：

It turned out that he was never there. 原来他根本没去过那儿。

It turned out that our calculations were incorrect. 结果证明大家的计算是不对的。