主系表结构后面的从句是什么从句?

I am worried that they don't finish the homework
这个that从句是什么从句

在这个例子中,"I am worried that they don't finish the homework","that they don't finish the homework" 是一个宾语从句。在这个句子里,主语是 "I",谓语是 "am worried","that" 引导的从句充当了宾语的角色,表示主句中的担忧对象。
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