So carelessly did he drive that he almost killed himself.这个句子还原是什么样的？

So carelessly did he drive that he almost killed himself.这个句子还原是什么样的？He drived so carelessly that he almost killed himself. 是不是还原这样，如果是这样的did为什么有没有了?为什么要去掉?

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so careless 放句首表示强调, 所以动词部分要倒装,加助动词did.还原成一般句型后did 就没有了