By her tone, it was an order, not a request.

She knew by his tone of voice that he meant it.

I could tell by his tone he was trying to control himself.

I could tell by his tone he was worried about my state of mind.

I could tell by his tone that something had gone wrong out there on the beach.

Yet he knew by her tone that she wanted to be convinced.

By her tone, she meant, I am glad to see you, but what is he doing here?

By her tone, he could tell that it was not really a request.

By his tone, he wanted nothing to do with the Patriot leader.

She glanced back at him, surprised by his serious tone.