But he says he cannot be sure why Mariam Khatib died until the samples are analysed.

BBC: Middle East

But he cannot be sure that the commission's recommendations will conform to the government's modest wishes.

ECONOMIST: Lords reform

Some will say he didn't mention them because he cannot be sure of achieving either growth or deficit reduction in 2012.

BBC: George Osborne chooses his words carefully

He has also steered largely clear of more volatile sectors, such as technology, where he cannot be sure that a company has a sustainable advantage.

ECONOMIST: Beating the market with beta

This is the first of two sightings Adrian has but he does tell us he cannot be a 100% sure of either as they were both at night.

BBC: Surrey puma sightings: Timeline

"The initial set of indicators suggests wide variation in both practice and outcomes between maternity units which is a source of concern for the specialty as we cannot be sure that every woman is getting the best possible care, " he said.

BBC: Maternity care varies across England