用it做形式主语帮忙改下

句子本来是What makes matters worse is that the room is rather small?
用it的话应该是：It makes matters worse that the room is rather small. 供参考It makes matters worse that the room is rather small. 句中the room is rather small是主句吗？“这使事情变得更糟糕”，It makes matters worse 是主句；后半句 “房间相当小”，that the room is rather small其实是解释it的内容。it是形式主语，真正的主语是that引导的从句。分主句和从句，主要看句子的主*分，从句一般是修饰主句里的成分（主语、表语、定语、状语等）。你好，我有些迷糊，哪个是主句啊It makes matters worse 是主句，that the room is rather small是从句。最后一个问题，It makes matters worse that the room is rather small是什么从句？主语从句，that引导的从句解释主句中形式主语it那that引导的从句不是主句吗？亲，你都说是从句了。主句是句子的主干，哪怕没有从句也是完整的，It makes matters worse“这使事情变得更糟糕”，各种成分已经完整了，但是it作为形式主语指代不明，什么使事情变得糟糕呢，答案是“房间相当小”。你要看句子的重点是要表达什么。that引导的从句虽然本身成分也是完整的，但它所包含的信息在整个句子中是作为主语的。整个句子本应该是：房间相当小使事情变得更糟糕。That the room is rather small makes matters worse. that引导的主语从句直接放在句首作为主语，这种表述方法也是可以的，但这样会显得句子头太重了，为了避免头重脚轻，有时候会才有用it作为形式主语。