"I couldn't help noticing you were alone," he said, trying not to sound nervous.

It's the secondary that he sounded a little nervous about.

His mother answered and sounded nervous to be getting a call so early in the day.

He sounds a bit nervous to me, and that's hardly surprising.

His voice sounded nervous, as though he was sorry now he'd started talking.

He sounded nervous, but it could just have been his telephone manner.

But she sounded nervous, excited I couldn't tell about something.

"You stay here," said the young man on his right, sounding nervous.

He ran a hand through his hair, sounded more nervous than she'd ever heard him.

I said, hoping that my voice did not sound nervous.