这到底是什么句型,成份怎么划分?

题目

这到底是什么句型,成份怎么划分?
Whether this is good or bad is difficult to say,but it certainly is different Childhood as it once was no longer exists.
这句话大概的意我是看得明白的,就是说“好与不好很难说清楚,但是可以肯的是曾经的童年不复存在了.”
请问“ but it certainly is different Childhood as it once was no longer exists.” 这个句子的成份到底怎么分?
“is" 与 ”was" 的主语是哪个?

答案

翻译 是否这是好的或坏难说, 但它一定是不同的.童年作为它曾经是不再存在.
but it certainly is different 与Childhood as it once was no longer exists是两句话,中间有个句号.
Childhood as it once was no longer exists中,Childhood是主语. exists是谓语
as it once was