非谓语:现在分词tired of sleeping on the floor

题目

非谓语:现在分词tired of sleeping on the floor
新概念49课有一句子
1)Tired of sleeping on the floor, a young man in teheran saved up for years to buy a real bed.
这句句子可以还原成:
A young man in teheran saved up for years to buy a real bed because he is tired of sleeping on the floor.
我想问一下,这句从句能否改成以下分词结构? 如果可以,又与第一句分词结构句子有什么区别? 如果不能改,原因又是什么?
2)Being tired of sleeping on the floor, a young man in teheran saved up for years to buy a real bed.
希望能说的详细些,是不是说在语法结构上都是可以的,强调的时间不同?

答案

这个不是现在时的问题~
是省略主语!
原句：he save up~because he is tired~
主分句主语是一个人,要省略掉分句的,同时可以省略掉系动词
而已,也可以用你说的那句being开头的