He sat down suddenly in the grass with his head bowed.

I was suddenly sitting on the edge of my chair.

She opened her eyes, blinked twice, and sat down quite suddenly on the ground.

He sat down suddenly, as though afraid his legs would no longer support him.

When the total impact of this idea hit him he sat down suddenly on the ground, stunned by it.

He sat down suddenly, as if standing had simply become too much of an effort.

As I looked at her, she sat down very suddenly and burst into tears.

Why's it suddenly two guys sitting alone in a car?

The general suddenly sat straight, gripping the arms of his chair.

About three in the morning I sat up very suddenly, wide awake.