As we approached the city, my mother kept muttering Greek spells to herself.

And Arnobius kept muttering that he didn't want to be harsh.

He kept muttering how I wasn't supposed to be there.

Ron kept muttering out of the corner of his mouth.

He kept muttering crazily about the three heads and the police.

The name must have stuck in his mind because that's what he keeps muttering all the time.

Keep muttering that to yourself as you rock on your haunches.

I kept muttering those words for hours, serving them up in my mind with a spice of bitter thought.

He kept muttering to himself as he made entries in the book.

"You're crazy," she kept muttering, and it was not idle talk.