帮我看看这段文字有没有语法问题,

题目

帮我看看这段文字有没有语法问题,
这是我写的一段文字,帮我看看其中有没有语法问题
a survey show that the enterprises which 30 years ago ascended into the top of the Fortune 100 now one third of them were eliminated.They are all large-sized enterprises,why can some enterprises keep theirselves strong in the long run,but some were beset with difficulties even be eliminated?The very important reason is that good enterprises can always actively adapt theirselves to changing circumstances and keep pace closely with the trends of times,but failed entrepreneurs react slowly on this problem.Change too fast for many enterprises to predict.

答案

不少错误 我给你纠正过的
A survey shows that one third of the enterprises that ascended into the top 100 of the Fortune (magazine) are eliminated.They are all large-sized enterprises.Why can some enterprises keep themselves strong in the long run,whereas other ones were beset with difficulties(这里你的even be eliminated没有在形容前面的主语）The very important reason is that good enterprises can always actively adapt themselves to changing environments and keep pace closely with the trend of time,while failed entrepreneurs react slowly on this problem.最后这句change too fast for many enterprises to predict 是从句吗 不知道你想表达什么）