When l entered the classroom ,l found Mary crying in the corner.本句主语I,谓语found,逗号前的是状语从句.crying in the corner做宾语Mary的补足语,是现在分词做宾语补足语的用法.
l asked her what had happend .本句主语I,谓语asked,并带出双宾语,其what had happend为宾语从句.
Looking into my eyes,she talked slouly about her stoty .本句主语she,谓语talked,Looking into my eyes做全句状语,是现在分词做伴随状语的用法.
Believing her friends too much makes her lose many chances.本句主语Believing her friends too much,其中主语核心是believing,是动名词做主语的用法；谓语makeS（本处应用单数第三人称,应该有s）；lose many chances是宾语her的补足语,是不带to的不定式做宾语补足语的用法.
整句翻译：当我走进房间的时候,我发现Mary在角落里哭泣.我问她发生什么事了.她看着我的眼睛,缓缓道出了她的故事.对于朋友的过分信赖让她失去了很多机会.