Some senators expressed uncertainty about how serious the pension system's problems were.

American parents often express uncertainty about helping their child with homework.

In business, Ryan had never expressed uncertainty, let alone fear.

Therefore, Hern expressed uncertainty about what all of these terms mean.

Many officials here expressed profound uncertainty over whether this week's talks would result in an agreement.

It wasn't often that Wu allowed herself to express uncertainty.

The answer rests on whether you want to express uncertainty or disbelief.

Her face expressing uncertainty, she waited for his re- action.

However, he expressed uncertainty about pairing Maggie with a man.

In general, express your affection or uncertainty clearly, unless there is a special reason to not.