ПРОШУ,ПРОШУ,ПРОШУУУ!!!!:(

Определите функцию причастий. 
1. We visited one of the largest plants producing tractors in our country.
2. He sat at the table thinking.
3. Standing on the bank of the river, he watched the dockers at work.
4. A broken chair lay on the floor.
5. This firm is interested in the purchase of automobiles produced by our plants.