When he was done, she sat thinking for a moment before speaking.

"I was just sitting here thinking what a good commercial you could make for these things," he said.

Sitting here thinking about dead people, as though his own life was over now.

I don't want her sitting there all alone thinking the world's going on without me.

I was just sitting here thinking every doctor should go out and get sick.

And he sat thinking hard with a look of his that I knew well.

She hung up the phone and sat thinking for a long time.

I sat thinking about this for a while and thought, well, there's a story!

After she left I sat thinking about her sudden change of heart.

People came and went as she sat thinking about this.