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有看到关于as倒装句的一些结论：

as引导的倒装让步状语从句，其前置的成分可以是形容词、副词、分词、名词短语甚至是谓语动词原型。

有以下一些疑问，还请指点：

（1）形容词被前置时，如果这个形容词是个形容词短语的话，是否只前置形容词部分？如：

  “Difficult as it is to believe，主句. "   还是   " Difficult to believe as it is，主句."

(2)表被动意义的分词短语前置时，是否只是前置分词？如：

“Praised as he was by them, he remainedmodest. ”还是“Praised by them as he was, he remainedmodest.”

(3)名词短语前置时，名词短语的修饰成分是否要一起前置？且这些修饰成分的位置需要改变吗？如：

“Lazy a boy as he is, he is kind to help others.”

(4)谓语动词原型前置时，助动词不一并前置，如果这个动词是个及物动词，宾语要一起前置吗？如：

"Help him as I did, he still failed."还是"Help as I did him, he still failed."