A number of specific rules depending on these three factors determine tone change.

But if that tone changes, she said, "there's no telling where this could go."

When they realize who I am, the whole tone changes.

But when we finally meet some of the citizens of Rome, the tone changes.

At first, his letters home are optimistic and bright but the tone changes as he spends more time close to the front.

Once inside, the tone changes somewhat, but not a lot.

Arguing that skin tone changes naturally is really neither here nor there.

She turned the flame down slowly, listening to the tone change as the heat diminished.

Tom heard the engine's tone change as the vehicle came to a stop.

However, the tone changes completely in the European Parliament report.