I didn`t know what was the matter还是I didn`t know whatt he matter was关于what`s wrong what`s up？what`s the matter?what`s your trouble?在宾语从句中应如何运用，

I didn`t know whatt he matter was

I didn't know what the matter is.

I didn't know waht the matter was

前者。
I don't know what was the matter.
因为这是宾语倒装的特例。

你好,让我来回答你的问题吧、正好这阵子我们老师有讲到,所以我可以很肯定.
I didn't know what was the matter.
宾语从句,我们都知道,从句应该用陈述语句出现,但是总有一些句子是例外的.
正好,你所问的都是例外噢!
有下列常见的问句,作为从句出现,是“不改变语句顺序”的.
1.What's the matter?
2.What's wrong ?
3.What's up
4.What's the problem?
5.What's your trouble?
等等、
目前,我认为较常见的就是这些问句.
另外,如果主句是过去时,带出的从句无论什么时候（真理、客观事实除外）时态也要随之变化.
例：
1.He wanted to know what was the matter.
带有客观事实的从句：
2.Teacher told the students that the Earth is round.
不知道这样说是否明白了哑~
希望能帮到你!

I want to know what's the matter.这句话是对的
我们都知道，宾语从句的语序要用陈述语序，但有两个句子是例外的，那就是what's the matter.和what is wrong.这两句语序无需改变