Вопрос по английскому языку:

Хелп плиз

Определите, к каким частям речи относятся слова с окончанием –ed. Предложения переведите на Русский язык.

a

1. When transported, gases are compressed into strong cycling.
2. The metals to be strengthened are subjected to special operations.
3. The pressure increased was measured precisely.
4. They increased the pressure in gas pipelines.
5. When discussed, the design was adopted.
6. Russia transported gas to many countries last year.
7. It was Lomonosov who first determined the existence of atmosphere round Venus.
8. A great many experimental models had been tested before the fist tidal power station was constructed.