it was careless of you to have left your clothes all over.---My God,_____

问题描述:

it was careless of you to have left your clothes all over.---My God,_____
I did.我知道意思:你把衣服放在外面,我的天,我的确做了.
为什么不是SO I was SO的倒装SO +助动词.+主语.助动词的选择不是根据原来句子中的词来看吗,原句子中有BE( was),为什么不是SO I WAS
写错了,我的天,我也是

原因很简单,因为是it was而不是I was.原句中是you to have left,所以did所代表的动词是leave,leave的动作是I做出的,所以要用so I did.
it是形式主语,代替的是动词不定式to have left.