Question

英语句子分析，请问这个that是不是错了呢？定语从句不能用that，如果是指示代词的话，后面又有the？

“There is very strong evidence, particularly in the over-50s, that the degree to which you maintain your mental faculties depends on a handful of quite simple environmental factors,” he said.

Answer 1

这个that没错，它是引导了限制性定从修饰evidence的，只是时间状提前插在了中间。

Answer 2

其实这就是其中多了个插入语，把particularly 这个时间删掉，就是一个简单的句子了。经典的固定句式，There is evidence that, that引导同位语从句。

Answer 3

that the degree (to which you maintain your mental faculties) depends on ... 是对前面 evidence 的具体说明，属于同位语从句。
注：括号中的 to which ... 是修饰同位语从句中主语 the degree 的定语从句。

Answer 4

“There is very strong evidence, particularly in the over-50s, that the degree to which you maintain your mental faculties depends on a handful of quite simple environmental factors,” he said.
that引导同位语从句，说明evidence的内容。

分析：
There is谓 very strong evidence主, particularly in the over-50s状语, that the degree to which you maintain your mental faculties depends on a handful of quite simple environmental factors同位语从句,
that引导词 the degree主语 to which you maintain your mental faculties定语从句 depends on谓语 a handful of quite simple environmental factors宾语