I don't know if

#. I don't know if ~

네가 아는지 모르겠는데 / 확실치 않지만 ~ 했는지 모르겠지만

 

I don't know if you know, but they are divorced.  나도 몰라 네가 아는지 모르는지. 네가 아는지 모르겠는데

> What? No way. When did this happen?  뭘라고? 말도 안 돼.

Last year.

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I don't know if you heard this.

I don't know if you already meet him. He is really handsome.

I don't know if you are married. If you are married you need to take there.