He was still staring at me, but his face underwent a subtle change.

The face of the center has undergone many changes.

When he heard the words, his face underwent a strange transformation.

Her face underwent a change that alarmed and even terrified me for a moment.

And as he spoke, his face underwent an abrupt transformation.

In that second of time Kara's face had undergone a transformation.

The face of print journalism in Canada is undergoing change.

Her face underwent a massive effort, produced a smile that put a knife through my heart.

And in the reflected light from the screen, the man's face was undergoing a transformation.

His face underwent such a change that I rose at once and looked in the room.