You have only to keep calm, as I am doing.

Trying to keep calm, she began to walk toward him.

I break away from his arms, trying to keep calm.

We know how to keep calm, at least on the outside.

I was trying to keep my voice even and calm.

An idea would come, if he could just keep calm.

Try to keep calm, and tell me exactly what happened.

The best thing for you to do now is keep her calm.

I kept my voice calm and easy through an effort of will.

He wanted to keep calm, but it was the same thing all over again.