Her mouth opened, but what she might have said was never heard.

My mouth opened, but I could think of nothing to say.

Her mouth opened as if she were about to say something.

Her mouth opened a couple of times, but no words came.

Her mouth opened, but she said nothing for a long moment.

The woman went very white, opened her mouth as though to say something.

Then she looked down his body and her mouth opened.

Her mouth opened to say something, but she bit the words back.

Its mouth opened until it took up half the face.

Her mouth opened and closed again, but no sound came.