She was gone for a long time, and the children began to worry.

For the first time I began to worry about the rest of the family.

I began to worry a little about what was going on here.

She didn't say anything for a moment and he began to worry again.

Her mother began to worry about how to support another child.

If he did not return on time, I began to worry.

She was gone over two hours, and they began to worry.

By now it was getting late and I began to worry.

As the two men left his office, Smith began to worry again.

When a few more minutes had passed, he began to worry.