английская грамматика

[Yulia]

Помогите ,пожалуйста, выполнить задание.
Переведите предложения,укажите,какую функцию выполняет слово на -ed:а)простое сказуемое,б)определение,в)часть составного сказуемого.
1. A feed additive is a nonnutritive substance that is added to feed to promote more rapid growth,to increase feed efficiency,or to maintain or improve health.
2.Antibiotics are substances used to help prevent or control diseases.
3. Total digestible nutrients include all of the digestible protein,digestible nitrogen-free extract,digestible crude fiber,and 2 Vt times the digestible fat contained in the ration.
4. They are materials left over from the production processes used in making flour and alcohol.
5.Both oil meals and sugar in the form of cane molasses and beet molasses are considered concentrates used in animal feeds.
6. Factors related to good sanitation include keeping facilities for animals clean.
7.This method is not used in our laboratory.