呜呜,,,

不好意思,,,老师,,,,我忘掉了.....Tired of sleeping on the floor...那个什么情况可省 be啊,,,,,这是7月份问的,我刚刚没找到,,,,

Tired of sleeping on the floor, a young man in teheran saved up for years to buy a real bed
原句：he ~~save up~~~~because he is tired~~~

本句省略了从句的主语。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
Tired of sleeping on the floor,a young man in Teheran saved up for years to buy a real bed.tired引导的分词短语省略了开头的being，其作用相当于原因状语从句：As he was tired of...，
基本上，词组，像be tired of,be faced of , be ~ed+介词等等，都有这种用法，主语跟这个短语是主动关系，就当做being ·····，省略being。