But not one formed within her own mind, of that much she was becoming certain.

The tremor beneath his feet steadied and became more certain.

That's the one thing that becomes more certain every day.

But I was becoming more and more certain that they were together somewhere.

Trip was becoming increasingly certain that it wasn't going to matter much longer how he answered the old man's questions.

Once Dresyl would never have permitted women running with them; but his command had become less certain as he grew older.

The Knight was becoming more and more certain that his plan had worked.

Instead he had become more certain that it was impossible.

With great effort I rolled my head to the right, toward the light, and became much less certain.

And later, when the loss of the Staff had become certain, they aided in searching for it.