have a doubt about something

So what have I got to doubt about her statement?

It was important that he didn't doubt her now, not about this.

Yet doubts about politics are still getting in his way.

There is also doubt about certain blind species that live in caves.

I doubt its about the money, the couple obviously don't need it.

He has also said that: "Performance gave me doubts about my way of life.

For the first time in years there is also doubt about the 48-year-old Senator's future.

He told me he'd never doubt you about anything again.

"But it's only just recently I've begun to doubt about it."

Just by human nature, I was starting to doubt everything about myself.