A thought formed in his mind, he knew not how.

And as he walked, the beginning of a plan began to form in his mind.

Study these cards and form a picture of them in your mind.

I hadn't let a picture of it form in my mind.

A plan began to form in the young man's mind.

It wasn't much, but a plan began to form in his mind.

But even as the question formed in his mind, so did an answer.

The words wouldn't form in his mind, but he could see what was going to happen.

So far, no clear plan had formed in his mind.

Again the image of David's face formed in her mind.