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？

你这里所说的两句句子都成立。
但，Being disappointed with the results of the experiments 应当看做是disappointe 动词的被动形式，不是现在分词做状语。一般很少这样用，Disappointed with the results of the experiments 已经能过足以表达原句的意思了。
Tied of sleeping on the floor, A young man saved up for years to buy a real bed. 是新概念第二册中某一篇。理解是一样的，但这个词“being” 是现在分词的形式，不能理解成现在分词做状语。
若要考虑时态的话，还可以：Having been disappointed with the results of the experiments, ... 。二者都可以，只是强调的不分不同。

二者都可以，只是强调的不分不同。
在句中，过去分词作状语，只是表原因；用Being disappointed的话，在表示原因的同时，强调disappointed和start a new one二者同时发生。原句不强调二者同时发生，所以没必要加Being。
补充中的问题一样，根据上下文来判断，如果是强调两件事同时发生，那可能就是省略了being。

你这里所说的两句句子都成立.但,Being disappointed with the results of the experiments 应当看做是disappointe 动词的被动形式,不是现在分词做状语.一般很少这样用,Disappointed with the results of the experim...

不能用现在分词做状语，因为这句话的时态是过去时。
如果要改成现在时,那前后时态要一致，如下：
Being disappointed with the results of the experiments, she decides to start a new one.