In the afternoon she had considered certain doubts very carefully, and decided on a more emphatic course of action.

We have certain doubts about the way Americans act.

The text merely says "certain doubts remained" about his origins.

Or, if they knew, there must be at least a certain doubt, a gap of uncertainty she could defend.

But as days went by, a certain doubt began to arise.

But at times I have entertained certain doubts as to your republican principles.

"We are ready," he replied, "but you will understand if I have certain doubts about your preparation."

Yet the narrative also provokes certain doubts in the reader's mind.

He said that there seemed to be a certain doubt as to Plancina's guilt.

There were certain doubts over whether the United States would take the same approach or not.