No one seems to have asked the nature of her interest.

It necessitates disclosure of the full nature and extent of the firm's interest.

"I am very curious to know the nature of your interest me."

I do wonder, however, the nature of your interest.

I didn't really understand the nature of my interest in food until I started writing about it.

I'm simply saying that because of the nature of our interest in guitars and playing, that's the way it is.

"I'm talking to a number of teams and I'm just trying to clarify the nature of their interest."

And her self-conscious glances told me she was trying to gauge the nature and level of my interest.

"Ah then, I do have other interests, perhaps if you could tell me the nature of your interest this time?"

They would have to appear to be getting quite intimate, so that no spy could doubt the nature of their interest in each other.