there be 句型的句子成分划分

But at the same time, there will be periods when I think is all that really hard work really worth my while?

这里用 there be 句型里句子结构是如何划分的？

when 引导的是定语从句吗？

But at the same time, there will be periods when I think is all that really hard work really worth my while?

句子中有二处错误。第一，句末的问号应改为句号。第二，is 应该坐落于hard work之后。

But at the same time, there will be periods when I think all that really hard work is really worth my while.

句子剖析如下：

But at the same time 时间状语, there 形式主语will be 谓语 periods 主语 （when 关系副词作时间状语 I 主语 think谓语 that 省略 all that really hard work 主语 is 系词 really worth my while表语.)定语从句