His mouth kept opening, as if to ask a question, and then he'd shut it.

Her mouth kept trying to tremble, but she was back in control.

He thought he'd stopped, but his mouth kept going: "I want it more than anybody does."

His mouth kept opening and closing, but I could not hear a sound.

I let her lead and set the pace, kept my mouth shut.

His mouth kept forming words, but no sound came out.

His mouth kept opening and shutting as if he was trying to say something.

Bo's mouth kept moving even after the words stopped coming out.

Although his mouth kept opening and shutting, he couldn't find anything more to say.

His mouth kept opening and closing, but no sound came out.