这是什么从句？

Question

The fact is that we still don't know when can we back to school.”是什么

Answer 1

一、本句话是含多个从句的复合句。
二、that we still dont know we can come back to school是表语从句。系动词是前面的is。
三、when can we back to school表达不正确哦。原因:we是主语，后面缺少谓语come或be。应该改为when we can come/be back to school。
四、修改后when we can come back to school是宾语从句。即，这句话做know的宾语。
希望对你有帮助哦！加油！

Answer 2

根据句子结构来看这是一个表语从句

Answer 3