Unit 215
（I see an opportunity for you, Peter.）
Hi! Betty! Where's your boyfriend?
I have no idea.

I have no idea. = I don't know.
I have no idea where he lives.
I don't know when he's coming back.
I have no idea when he's coming back.
I have no idea why he's crying.
I have no idea about his background.
I don't know about his background.