請分析一下下面這個句子
原句：Because she was disappointed with the results of the experiments,she started a new one.
過去分詞做狀語：Disappointed with the results of the experiments,she started a new one.
（可否用現(xiàn)在分詞做狀語,改成：Being disappointed with the results of the experiments,she started a new one.）
如果可以,現(xiàn)在分詞做狀語的句子與過去分詞做狀語的句子有什么區(qū)別?
原句：Tied of sleeping on the floor,A young man saved up for years to buy a real bed.
書上給出的分析是說這句話是省略了現(xiàn)在分詞Being。那為什么不直接理解成過去分詞做狀語？