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我想那个学生写在黑板上的那个"that"是错的

I think that(引导宾语从句) that(代词:那个,修饰后面的'that') that(这个应该加引号,作为名次) that(引导定语从句,修饰的是that 'that' ) that(代词:那个,修饰student) student wrote on the blackboard was wrong

可以同意代换为
I think that the 'that' which the student wrote on the blackboard was wrong
或者
I think the 'that' which the student wrote on the blackboard was wrong
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这样写更容易理解了吧

我认为，那个那个那个那个学生在黑板上写的是错误的。