The young woman's face did not change as she looked down at her board.

His face does not change when he's looking at us.

Even the very face of the land itself had changed.

As she stood looking down at them, her face changed.

The school teacher's face changed color, but he did not speak.

Her face had changed too, but not in the same ways.

The face had changed, but the eyes were the same.

But over a period of minutes, the face had changed.

He would be the same, no matter how his face had changed.

The face of the industry has changed during the last few years.