i want to know后面的句子要怎么接

I want to know that...
i want to know if...
i want to know is...
和直接加问句
分别怎么用啊

I want to know that he is bmy best friend. 后面接的是宾语从句

I want to know if you are right. 后面接的是带有疑问的宾语从句

What I want to know is he is a student. what I want to know作主语,is后面是表语
亲:祝你学习进步,每天都开心V_V!
望采纳,thx!
Mr Gao
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