请分析一下下面这个句子
原句：Because she was disappointed with the results of the experiments,she started a new one.
过去分词做状语：Disappointed with the results of the experiments,she started a new one.
（可否用现在分词做状语,改成：Being disappointed with the results of the experiments,she started a new one.）
如果可以,现在分词做状语的句子与过去分词做状语的句子有什么区别?
原句：Tied of sleeping on the floor,A young man saved up for years to buy a real bed.
书上给出的分析是说这句话是省略了现在分词Being。那为什么不直接理解成过去分词做状语？