Some things you'll never know, and some things you'll wish you never knew.

Some things you'll never know, and some things you'll wish you never knew.

I wish I knew how to quit you.

I wish I knew, Mom, ... I wish I knew where she is.

I knew you had my pads, ... I knew it, I knew it!

He may have bumped his head on the way out. It's tough to say. I wish I knew.