His tone of voice suggested he might see more than she was actually saying.

The tone of her voice suggests she is not happy.

The tone in his voice suggested he already knew the answer.

His tone suggested that he had never expected to see Earth again.

His tone did not suggest that he held out much hope of the last.

His tone suggested John was off on a business trip.

It was only three words but the tone suggested a few more.

Her tone suggested that she'd like to call him something else.

His tone suggested that he thought it was anything but.

But his tone of voice suggests that it's not really fine at all.