He couldn't tell whether she had picked up the Will and was struck by sudden doubt.

As he spoke the words, he felt a sudden doubt.

But as she said it, she had a sudden doubt.

He shook the sudden doubt from himself, and the keys came down under his fingers.

Yet even as he heard himself saying these words, a sudden doubt crossed his mind like a shadow.

Boariyi turned back to him with sudden doubt in his face.

The sight filled him with a sudden doubt, for he knew too well the meaning of those lines.

Then he stopped, as though a sudden doubt had occurred to him.

But now, after being so sure, I couldn't put it away, the sudden doubt.

I had a sudden doubt whether fifty years would be long enough.