请问这些句子的宾语从句怎么改?根据是什么?What's wrong?What's the matter?What's the trouble?what's the problem?把上面的句子放在I don't know后

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请问这些句子的宾语从句怎么改?根据是什么?
What's wrong?
What's the matter?
What's the trouble?
what's the problem?
把上面的句子放在I don't know后

1.I don't know what's wrong.
2.I don't know what is the matter.
3.I don't know what the trouble is.
4.I don't know what the problem is.
原因:宾语要求用陈述句语序,即主语在前,谓语在后.第1、2句中的主语是what,因此不用改变语序.但第3、4句中的what不是主语,the trouble和problem是主语,因此把what放前后,后面的语序应先写主语(the trouble和problem)然后写动词(is).

I don\'t know what the wrong is.
I don\'t know what the matter is.
I don\'t know what the trouble is.
I don\'t know what the problem is.